InnoDB is the general purpose and default storage engine for MySQL deployments. When tables are created without an engine clause InnoDB is used as the default storage engine.
More information on the InnoDB storage engine can be found in the MySQL documentation.
If InnoDB is not currently set as the default storage engine it can be set as the default by adding the below to the [mysqld] section of the MySQL server option file:
default-storage-engine=innodb