Light is an important commodity in Minecraft. It helps players see things better, especially at night, as well as prohibits mobs from spawning (if there's enough light).

Minecraft players can turn off mobs in their server settings, using commands, or they can even turn off individual monsters using Command Blocks.

Some eyes from mobs like Endermen, Creepers, Spiders, and Phantoms will remain visible even if the mob itself is invisible. Here is some more general information regarding Potion of Invisibility ...

You can get a command block in your Minecraft Java or Bedrock world using cheats and a special chat command.

Introduced in Minecraft 1.17, light blocks are invisible items that produce light levels ranging from zero to 15.