plugin is.

A plugin is a tool that some other developer, a third-party developer a lot of time, not hired by WordPress, built so that way people who are working in WordPress and want to do some other function that their WordPress theme or builder or just website in general can't do.

A developer will make a plugin.

They might make it paid so they can make some money from their work.

And then they post it up into the WordPress plugin area, a plugin store.

So you can download it, install it.

Sometimes you have to go to the developer direct to download and install a plugin.

I know that was