PSO18 is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "Formatted Address Data" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_PSO18 TYPE PSO18.
The PSO18 table consists of various fields, each holding specific information or linking keys about Formatted Address Data data available in SAP. These include NAME2 (Name 2), NAME3 (Name 3), NAME4 (Name 4)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .