Which

Which[test1, value1, test2, value2, ...] evaluates each test in turn, returning the value corresponding to the first one that yields True.

Examples

Multiple conditions:

x = 5;
Which[
  x < 0, "negative",
  x == 0, "zero",
  x > 0, "positive"
]
(* "positive" *)

Please visit the official Wolfram Language Reference for more details.