A tie is a thin piece of cloth that's knotted around the neck, an accessory worn by men on formal occasions. You may wear a tie to graduation, a wedding, or if you're just trying to impress someone.
If the score of a game is equal, then the game is a tie. Some games, like chess, can actually end in a tie, but other games, like basketball, continue until there's a winner. You can also use the word tie as a verb: "Looks like the game will tie at two apiece." As a verb, tie also means to fasten two or more things together, like when you tie your shoelaces or your tie.