SeedRandom

SeedRandom[s] resets the pseudorandom generator using s as a seed.

SeedRandom[] resets using the time of day and session attributes.

Examples

Set a fixed seed for reproducibility:

SeedRandom[42];
RandomReal[]
(* 0.370286... *)

Same seed gives same results:

SeedRandom[42];
RandomInteger[100]
(* 37 *)

Please visit the official Wolfram Language Reference for more details.