xkcd is a webcomic created by Randall Munroe, a former contractor for NASA. Munroe describes it as "a webcomic of romance, sarcasm, math, and language." It is a widely read webcomic (it tallied between 60 and 70 million page views during October 2007) and has been recognized in mainstream media such as The Guardian and The New York Times. Munroe states there is no particular meaning to the name and it is simply a four-letter word without a phonetic pronunciation, something he describes as "a treasured and carefully-guarded point in the space of four-character strings." The subjects of the comics themselves vary.

Some are statements on life and love (some love strips are simply art with poetry), and some are mathematical or scientific in-jokes. Some strips feature simple humor or pop-culture references. Although it has a cast of stick figures, the comic occasionally features landscapes, intricate mathematical patterns such as fractals (for example, strip #17 "What If" shows an Apollonian gasket, or #543 "Sierpinski Valentine" and #95 "Sierpinski Penis" for a Sierpinski triangle), or imitations of the style of other cartoonists (as during "Parody Week").

The comic is available under the Creative Commons Attribution-NonCommercial 2.5 License. New comics are added three times a week, every Monday, Wednesday, and Friday at midnight Eastern Time, although on five occasions so far they have been updated every weekday: parody week, the "Choices" series, the "1337" series, the "Secretary" series, and the "The Race" series.

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