In Unity, Tag are references assigned to one or more GameObject in-game.

As the project grows, the number of GameObjects in the game will increase accordingly. This creates difficulties in managing them.

That's why we use Tag to group and, in some cases, manage GameObjects in bulk.

For example, you can group all the reward objects that your character will earn by progressing in a level in a Tag named award so that you can more easily manage their common points.