Put

expr >> filename writes expr to a file.

Put[expr1, expr2, ..., "filename"] writes a sequence of expressions to a file.

Examples

Save an expression:

{1, 2, 3} >> "mydata.m"

Save multiple expressions:

Put[x = 5, y = 10, "values.m"]

Read back with Get:

Get["mydata.m"]
(* {1, 2, 3} *)

Please visit the official Wolfram Language Reference for more details.