Cluster tables:

Table type in the ABAP Dictionary.

The data of several cluster tables is stored together in a single table cluster in the database. A cluster table is thus known only in the ABAP Dictionary, not in the database.

Pooled tables:

Table type in the ABAP Dictionary.

The data of several pooled tables are stored together as a table pool in the database. Therefore, a pooled table is known in the ABAP Dictionary, but not in the database.

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