Goliath (/ɡə.ˈlaɪ.əθ/ gə-LY-əth) is a Philistine warrior of giant stature who plays a pivotal role in the origin myth of King David in the Book of Samuel. According to 1 Samuel, Goliath challenges the Israelites to best him in single combat. David, then a young shepherd, takes up the challenge and kills Goliath with a stone slung from a sling. The narrative signifies King Saul's unfitness to rule for not taking up the giant's challenge himself.
The phrase "David and Goliath" has taken on a more popular meaning denoting an underdog situation, a contest wherein a smaller, weaker opponent faces a much bigger, stronger adversary. Some modern scholars now believe that the original slayer of Goliath in the text may have been Elhanan, son of Jair, who features in 2 Samuel 21:19, in which Elhanan kills Goliath the Gittite, and that the authors of the Deuteronomistic history changed the original text to credit the victory to the more famous figure of David.