Seed New
World seedWorld seeds
A seed is a random number used by Minecraft to generate a World.
Minecraft accepts text as seeds as well, but it will be converted to a number using an hash algorithm. Seed hashing.
Minecraft’s World generation algorithm is deterministic, meaning starting from the same seed, the same World will be generated. If the World generation algorithm is updated between Versions, starting from the same seed, a different World will be generated.
The terrain generation part of the algorithm is the same for Bedrock and Java but Structures will be placed differently. Seeds inspector.
You can view the seed of the current World of using the Seed command.
/seed
Minecraft Wiki