The Oracle Data Dictionary contains information about data base objects, users and events. You can access this information through these views of the data dictionary.

View Description
USER_ROLE_PRIVS Roles granted to the user.
USER_TABLES aka TABSDescription of the user's own tables.
USER_TAB_COLUMNS aka COLSColumns of user's tables, views and clusters.
USER_TAB_PRIVS Grants on objects for which the user is the owner, grantor or grantee
USER_VIEWS Test of views owned by the user.
USER_TRIGGERS Descriptions of the user's triggers
USER_OBJECTS aka OBJObjects owned by the user
USER_INDEXES aka INDDescription of the user's own indexes
USER_IND_COLUMNS Columns of the user's indexes or on user's tables
USER_SEQUENCES Description of the user's own sequences
USER_SOURCE The text source of the stored objects