Table and Database Operations - Mastering phpMyAdmin 2.8 for Effective MySQL Management - page 147

Table Type
The first attribute we can change is called Table storage engine :
This controls the whole behavior of the table: its location (on-disk or in-memory),
the index structure, and whether it supports transactions and foreign keys. The
drop-down list may vary depending on the table types supported by our
MySQL server.
Changing the table type may be a long operation if the
number of rows is large.
Table Comments
This allows us to enter comments for the table. These comments will be shown at
appropriate places (for example, in the left panel, next to the table name in the Table
view and in the export file).