Admiral Ackbar (played by Timothy M. Rose, voiced by Erik Bauersfeld) is a character in the Star Wars fictional universe. He first appears in Star Wars Episode VI: Return of the Jedi and later is a supporting character in the Star Wars Expanded Universe of novels, video game, and comic book.
As described in the Expanded Universe series, Admiral Ackbar became a representative to his planet Mon Calamari's ruling council shortly after he finished school. After the Empire invaded Mon Calamari, Ackbar was captured and enslaved, for a time serving Grand Moff Tarkin.
After being freed, Ackbar helped design the B-wing starfighter and lead the Rebels' space forces at the Battle of Endor. He is part of the New Republic's provisional government in Timothy Zahn's Thrawn trilogy. He retires at some point before the beginning of The New Jedi Order series, but comes out of retirement to help fight the Yuuzhan Vong. Ackbar dies of old age shortly after the war ends.
Admiral Ackbar's best-known line is "It's a trap!," which he utters in Return of the Jedi as the Empire ambushes the rebel fleet. This line has been parodied, such as by the animated show Robot Chicken in their Star Wars special episode. The name of the upcoming Family Guy Star Wars special episode "It's a Trap!" is based on his quote. "It's a frap!" and "It's a tarp!," modified versions of the line, are both internet meme.
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Links: Wikipedia: Admiral Ackbar Star Wars Databank Star Wars Galaxies Stratics