As the internet began to grow and evolve, many cartoonists found this as the perfect opportunity to get their content out to a worldwide audience. The newspaper market is a hard one to get into so young cartoonists found an ever increasing audience through the interent, or web as it was also becoming known. The term came about by simply combining the words web, for internet, and comic, for...well, a comic.
Most webcomics follow the basic newspaper comic strip format, that is, three to four panels with the punchline in the last panel. Unlike the newspaper strips, where only the Sunday comics are in color, many webcomics are in color every time they are updated, while others go the black and white route.
The great thing about webcomics is that you can find one for just about every subject, no matter how random or odd it may be. Most webcomics are of the humor variety, but you can find, romance, western, science fiction, and even long form webcomics, which resemble your basic comic from Marvel or DC Comics.