Make MySQL behave more like newer (or older) releases of MySQL.
The initial path i.e.
mysql-57/ refers to the current version that you have installed. Inside that path are one or more compatibility file options.
For example, if I want to make my MySQL 5.7 server behave like MySQL 5.6, I would download
mysql-57/mysql-56.cnf and add it to
/etc/my.cnf directly under the
[mysqld] option heading:
[mysqld] !include /etc/mysql-56.cnf /* your other options appear below */