I was studying at a local development environment building course with dot installation.
Since the CentOS version to be installed is old, I decided to study from the installation by myself.

At first there was a box called vagrant box add.
Before that, check the box list with vagrant box list

bento/centos-6.8 (virtualbox, 2.3.4)

There was something called

If i run vagrant box add centos/7 and display the list again

bento/centos-6.8 (virtualbox, 2.3.4)
centos/7 (virtualbox, 1905.1)

It was


What is the difference between bento/centos-x and centos/x?