For our discussion, we will break the table types into three groups. As a developer, you can change the definition and the contents of the first group (i.e. Totally Modifiable Tables). You cannot change the definition of the second group, but can change the contents (i.e. Content Modifiable Tables). The third group can be accessed for information, but data within is not modifiable (i.e. these table are intended to be Read-Only Tables).
The following are the tables in the Totally Modifiable Tables group: