This Chapter describes the structure and use of tables in the MIDAS system. Section 5.1 is a general introduction. The table structure is outlined in section 5.2. Different functional aspects of the tables are described in sections 5.3 (Input/Output), 5.4 (Management) and 5.5 (Operations). A review of the commands is given in section 5.6, a more detailed explanation is included in appendix A. Section 5.7 describes format files to control input/output operations. Finally, section 5.8 contains an example that can be run at a terminal with graphic capabilities as TUTORIAL/TABLE.