What is the purpose of the : (colon) GNU Bash builtin?

What is the purpose of the : (colon) GNU Bash builtin?

bash shell built-in

bash

Don't display pushd/popd stack across several bash scripts (quiet pushd/popd)

bash output built-in

bash

How to use the read command in Bash?

bash built-in

bash

What does "< <(command args)" mean in the shell?

bash shell built-in

bash

In bash, how to get the current status of set -x?

bash set built-in

bash

How do I prevent bash to use a builtin command?

bash sh built-in

bash

Bash variable substitution on find's output through exec

bash find exec substitution built-in

bash