Oh the HUMANITY!! How do I deactivate one game object and then activate another?

Here’s my issue. I’m making a game that requires something that I cannot find on the forums, the Unity manual or on YouTube.
I have the need to be able to have many GameObjects that all have scripts. What I need to do is use my mouse to click on the object in game mode and deactivate it. Then, click on a different game object in game mode and activate that one, and back and forth, or have them all activated at one time. I know there must be a way to accomplish this.
I’m fairly new to C# and I’m going nuts with this one. “Driving” objects around is no issue as there’s a zillion ways to do it. I don’t want to use collisions to perform this task, just simple mouse clicks.

ZWEEEET! Thank you for the information!!