Generally when using docker on a Mac you are actually running linux containers, so you need a linux virtual machine.
Colima is a low-configuration command line tool to spin up a linux VM (using Lima) which includes docker support, so you can run docker commands in the Mac terminal but the containers actually run in the linux VM.
You still have to install the actual docker CLI tool separately via Homebrew etc. Colima just provides everything else.
This is also what happens generally when you install and run Docker Desktop on Mac or Windows, I just like Colima because it’s a much lighter installation and doesn’t come with the commercial paid license requirement of Docker Desktop.
