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A spoiler, named because they sometimes "spoil" a fan's enjoyment of the canon, is information (usually plot-related) about upcoming or recently-released serial source information.
History of the Term
Possibly the first print use of the term was in the April 1971 issue of National Lampoon. In that magazine, Doug Kenney wrote an article called "Spoilers" that listed spoilers for famous films and movies. 
Another early use was mentioned in September/October 1980 when a fan chided another for giving away the ending to a story and wrote:
At the very least, I suggest those who plan to review fanworks, take the time to read the columns in pro sf zines. Inevitably, you will cross the path of Spider Robinson (reviewing for Analog right now) and his invarying [sic] use of the simple 'WARNING: I AM ABOUT TO COMMIT A SPOILER. IF YOU DO NOT WANT TO KNOW THE END OF THIS STORY, SKIP THE REST OF THIS PARAGRAPH. 
An example from May 23, 1981 by Bruce Hamilton:
Date: 12-May-81 11:15:45 PDT (Tuesday) From: Hamilton.ES at PARC-MAXC Subject: Re: Stephen King's "Danse Macabre"
Note: the book is full of complete spoilers for every piece of notable horror (including much SF) ever written/ filmed. The claimed scope of the book is books, films, and TV of the past 30 years, but King doesn't hesitate to go back to three paradigms which he believes define most of modern horror: "Frankenstein", "Dracula", and "Dr. Jeckyll [sic] and Mr. Hyde". His fourth paradigm is the ghost story, which King explicates through reference to several contemporary works.King is at his best discussing the literary genres. Unfortunately, he doesn't seem to have developed any sort of cinema esthetic, so that his "discussion" of film is a tedious rendering of "gee whiz" plot spoilers, with a few references to the sort of sociological truisms that any film critic takes for granted (e.g. Don Siegel's "Invasion of the Body Snatchers" as a depiction of McCarthyism). 
Another example is from June 8, 1982 by Wayne Hamilton:
[SPOILER ALERT]regarding Spock's parting gesture to McCoy, it wouldn't surprize [sic] me if that's how they bring him back (if they do); but then, i have a low opinion of ST's script(s). Spock's farewell to Kirk sounded pretty final to me. wayne hamilton  
At this point I think I ought to put in a SPOILER ALERT for those who have not read "The Wise One" & don't want to know about its truly astonishing ending in advance. All those to whom the warning applies shouldn't read this paragraph. 
A 1988 use:
Now we get to a story with a definite plot problem. In order to properly discuss this, I must reveal the ending of the story. So I am issuing a SPOILER WARNING.- Don't read the rest of this paragraph if you haven't read "Make Me A Miracle" by Robin Hood and don't want to know the ending. 
Definition and Types
What is or is not a spoiler is often a matter of debate. Creator statements, such as from interviews, are not generally considered to be spoilers unless they refer to material that will be explicitly featured in canon later on.
Some fans also consider information about what actors will appear in what episodes of a tv series to be a spoiler; for instance, the surprise return of a long-lost character could be spoiled if fans know that the actor who plays that character is returning to the show. These are often referred to as "casting spoilers."
"Mood spoilers" are another type of spoilers. On Livejournal and other journalling sites, the author of a post can often specify what "mood" she is currently in, such as "elated" or "depressed." Some fans believe that even in the absence of all other spoilery information, indicating one's mood in this way can be spoilery. A mood spoiler can also be found in a title or an lj-cut; for instance, if a fan who was well-known to be a die-hard shipper of a certain pairing made a post titled "OMGSQUEE BEST EPISODE EVER," it could possibly be inferred that there had been positive developments regarding her OTP. Other fans have stated that it's not so much a single mood spoiler that is the problem, but that an entire flist full of various mood spoilers makes it somewhat impossible to not draw inferences about the quality of, or new developments in, new canon.
The term spoiler is sometimes used to refer to a fan who shares spoilers. This term describes their fannish activity and doesn't necessarily carry negative connotations. In some fandoms, spoiler communities (communities of fans seeking out spoilers) are common and trusted spoilers sometimes achieve BNF status within these communities. An associated term is foiler, which refers to fake spoilers or fans who intentionally share fake spoilers.
Many communities require spoiler warnings or outright ban spoilers in posts. Spoilery information (for discussion) generally has an expiration date, after which it is acceptable to discuss without warning other users. For example, an expiration date could be one week after the US or UK air date, for a television series, or one month after the release date of a comic book. Since fans in different geographical regions may not be able to view episodes for weeks, months, or even years after their original air dates, some fans and some fandoms have longer statutes of limitations.
Fandoms that actively cultivate new fans, such as Farscape fandom, are often careful to welcome viewers watching the show for the first time without spoiling them for future plot points.
It is common to give a spoiler warning in the header of a fan fiction story if it contains numerous references to a specific episode or book. This is far more common in the immediate aftermath of the episode, when many fans either may not have had a chance to view the new canon, or may be specifically seeking out fan fiction that deals with events in the new canon.
An example of a 1994 "spoiler plate:
OK - here's another example of a spoiler plate... (sigh... just realizing how many weeks we have to wait to use it!)
- Wonderfully creative way of handling spoilers, I tell ya! :-)
- Yet... methinks that us rastb5-ers should NOT limit ourselves to just this one creative example of spoiler artwork. The newsgroup alt.ascii-art has plenty of cool examples of things we can use.
- For instance, can you imagine a spoiler rose? Just upload a rose with the word "spoiler" added to the leaves, and ya gots a creative new cool thing to enjoy besides the spoiler post itself - and instead of a boring page of blank space.
- While I liked your artwork, Elana, I disagree with the sentiment; I prefer the 20-some blank or nearly blank lines, just because they're so much faster to get past. Bill's Spoiler Plate was kinda cute the first time, but now I find it rather annoying.
By the time fandom had taken up residence on mailing lists, it was more common to use the word "Spoiler" in the subject line and to provide "spoiler space" -- multiple lines of space before the spoilers appeared. On blogs and Livejournal-type services, spoilers are more often put "below the cut", requiring a reader to deliberately click a link to see the spoiler.
Some fans also use HTML to hide spoilers; for instance, putting spoilers in white text on a white background. This requires the reader to highlight the text in order to be able to view the spoilers; however, it is not always implemented correctly, sometimes resulting in unintentional spoiling.  In addition, this formatting may not be accessible to, or may not work to obscure the spoiler for, all readers, such as those who browse the internet using screen-readers.
A 2010 example of the tightrope some fandoms ask their fans walk is illustrated by this correction by a Live Journal Professionals community mod to a new fan who'd posted a fiction recommendation:
Quick mod message - please don't put spoilers above a cut, in this comm! For some people "Not a death fic" is a spoiler! And "Spoiler warnings!" is also a spoiler cos it tells people there are warnings, and therefore something to warn for! There's a long history in Pros of being considerate to people about spoilers and we'd like to carry on with that... If you just put something like the title, or "More information" or something as the lj-cut text, then anyone who's worried can click there to find the spoiler info, and anyone who wants to enjoy the story first can do so. 
Some fans are more sensitive to spoilers than others. Some fans even self-identify as spoilerphobic, while others do not find that their enjoyment of canon is ruined by major or even mild spoilers. The relationship between spoilerphobic and non-spoilerphobic fans is sometimes fraught.
Spoilerphobic fans often request that other fans take precautions to avoid posting spoilery information. Non-spoilerphobes may feel that they are being asked to go to unreasonable lengths in order to protect over-sensitive spoilerphobes. On the other hand, spoilerphobic fans may feel that their requests are entirely reasonable, and a refusal to comply is callous and rude.
The Spoiler and Warning/Label Debate
In 2005, a fan pointed out what they felt to be a disconnect in expectations between fans who didn't want to be spoiled regarding canon details, such as an episode, movie, or book, and those who insisted upon labels and warnings for fanfic:
It feels illogical and unfair to me for people to demand that there not be spoilers for episodes at the same time they demand that there be spoilers for fanfic. It has been my experience that the people who scream the loudest about the accidental posting of a spoiler for an episode are the same people who demand that *everybody* has to put up with spoilers for fanfic. Why is it considered fair to cater more to one set of desires than to the other? Being told the ending of a story before I read it (i.e., that there will be a death) guts my feelings as much as reading a death story guts yours... and note, please, that warnings in message lines are impossible to miss.I feel obligated to go along with the community standards for warnings, but my snark is that I personally think it's an unjust double standard. 
- Something Rotten on the Internet by Mary Jean Holmes (2002)
- The Sliding Scale of Story Information, or Labels and Warnings and Spoilers, Oh My!, Archived version by cereta (April 1, 2003)
- Spoiler Alerts Need To Die by Alex Mell-Taylor (May 3, 2019)
- Why everyone should just read those spoilers anyway, Archived version at The Daily Dot (2015)
- Remembering The Late Doug Kenney, ‘National Lampoon’ Cofounder And Possibly The Funniest Man Who Ever Lived by Stoogeypedia (December 10, 2021)
- from a rebuttal of a review for You May Deny in Universal Translator #5
- Subject: SF-LOVERS Digest V3 #121 (May 23, 1981)
- from A Question - (nf)
- From a 2018 Slate article: "This new use of the computer network, however, created all sorts of new problems too. One was the fear that a user might share information that someone else didn’t want to see. This led to the very first online “[SPOILER ALERT],” which the author put above his message to warn readers before describing (spoiler) the death of a certain heroic Vulcan at the end of The Wrath of Khan. -- The Slate Group logo, Archived version
- from Not Tonight Spock #10 (Summer 1985)
- from On the Double #7/8 (May/Summer 1988)
- from Creative approaches to spoiler warnings :-) (December 25, 1994)
- Florahart, PSA regarding whiting out things you want someone to have to highlight to see., accessed June 07, 2009.
- 2010 comment at CI5hq
- from a mailing list, quoted anonymously (April 2005)