why are both mariaDB and mysql installed? (no replies)

Hey i just installed wamp server 3.2.
It installs both mariaDB and mysql..

i thought no one used mysql for some years now and everyone converted to maria. What is the point of having two databases installed and running on a host? I dont get why even when i select custom install, i cant uninstall mysql.

So do i have to use mysql now? i guess so because its the default DB by the looks of it, running on 3306. Just strange you wouldnt give people the option.