Greedo is a minor character from Star Wars - Episode IV: A New Hope. He is a Rodian bounty hunter who works for Jabba the Hutt, though his ineptitude at his job leads to his downfall.
Before the Millenium Falcon takes flight, Greedo confronts Han Solo in Chalmun's Spaceport Cantina, demanding that Han pays the money that he owes to Jabba the Hutt. Han argues that he has the money, just not on his person, and Greedo tells Han that Jabba has lost his patience. Having been humiliated by Han in the past, Greedo is very much looking forward to killing the smuggler, but as he keeps talking he fails to notice Han readying a blaster beneath the table. Han fires his pistol and blasts Greedo, killing him.
Who shot first?
Greedo's scene has become infamous among Star Wars fans for being edited by George Lucas when the original trilogy was re-mastered in 1997. In the original cinematic release, Han Solo shot Greedo before Greedo could pull the trigger. In the re-mastered versions, Greedo fires off a shot and somehow misses Han despite being in point-blank range. This has become a popular meme amongst the Star Wars fan community.
Star Wars Han Shoots First
'Greedo Shoots First' from Star Wars Episode IV - A New Hope (Blu-Ray Clip)