E2KONH 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 "Data from condition header" 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_E2KONH TYPE E2KONH.
The E2KONH table consists of various fields, each holding specific information or linking keys about Data from condition header data available in SAP. These include DATAB (Valid-From Date), DATBI (Valid To Date), KOSRT (Search term for conditions), KZUST (Responsibility in SD for condition/material)... 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. .