Most living creatures in Minecraft can spawn in specific conditions without the player doing anything.
Some mobs, like zombies and skeletons can spawn in multiple ways, like through spawners and automatically in places where the light levels are less than 7.
Mobs spawning may or may not be beneficial for the player, depending on where it spawns.
Players often try to stop mobs from spawning above their mob farms as this will reduce its numbers inside the farm and lower its efficiency.
Also read: List of all mobs in Minecraft after 1.17 Caves & Cliffs Part 1 update
