Extract data sets are made of records sequences, we can have various structures for the records, record types are in fact a group of records that have the same structure. Every record type that an extract dataset has can be defined as a field group with the statement FIELD GROUPS. The FIELD GROUPS statement brings multiple fields together with providing one single name. Usually we should declare the field groups when the declaration part in a program is finished, this will make everything clearer.Field groupsdon’tgenerate field space but they show the fields that already exist, they show us the records content if the records are met in the extract dataset.