What does linking/unlinking with Homebrew mean?

Question

What does it mean to link/unlink something with Homebrew?

Answer 1

It creates a symlink from packages installed in Cellar (regular packages installed with homebrew will already be linked).

What this also does is allow the symlinked installation from Cellar to serve as a dependency for other homebrew installations (if it's required). This is explained in another post.

Also with all homebrew commands you get a description of the formulae with the --help option (e.g. brew link --help).