The Walking Dead is a American comic book created by writer Robert Kirkman and artist Tony Moore, published monthly in black and white (with colour covers) by Image Comics. It features the travails of a group of people trying to survive in a world overrun by zombies.
The series debuted in 2003. Moore left with issue #6 in 2004. He was replaced in #7 by Charlie Adlard who continues to work on the title.
The main protagonist is Rick Grimes, a cop who awakens out of a coma to find that while he was asleep the dead have returned and wreaked havoc on civilisation. We follow him as he attempts to find his loved ones and seeks sanctuary in a new and very dangerous world.
The series borrows many of its concepts as well as much of its tone from George A. Romero's zombie movies (Night of the Living Dead, Dawn of the Dead, Day of the Dead and Land of the Dead).
Specifically, the world depicted is one where normal civilisation has been destroyed by the rise of the dead, whose only urge is to seek out and consume live flesh and whose slow witted and decaying condition is contagious (generally communicable through bodily fluids) and instantly achieved upon death. This situation leaves normal human beings in the minority, generally on the move and constantly under threat.
The series has so far been collected into three trade paperbacks:
Image Comics' Robert Kirkman Messageboard