Why is a "GRANT USAGE" created the first time I grant a user privileges?

Why is a "GRANT USAGE" created the first time I grant a user privileges?

mysql database privileges grant

database

Spring Batch Framework - Auto create Batch Table

database spring spring-batch privileges ora-00942

database

Restricted PostgreSQL permissions for web app

database postgresql web-applications privileges least-privilege

database

create db and user mysql and set privileges php [closed]

php mysql database privileges

database

Why not use the built-in MySQL users and permissions for a website?

php mysql database permissions privileges

database

How can I ensure that there is one-and-only-one row in DB table?

mysql database database-design privileges

database

no privileges on tablespace 'USERS'

database oracle privileges tablespace

database

grant usage & privileges on future created schema in PostgreSQL

database postgresql privileges

database

#1130 - Host ‘localhost’ is not allowed to connect to this MySQL server

mysql database phpmyadmin privileges mysql-error-1130

database

MySQL application users vs database users

mysql sql database privileges

database

Oracle newly created user privileges issue?

database oracle privileges

database

Restore default privileges in PostgreSQL

database postgresql privileges

database