What are the fields in Purchasing view?

Some of the fields in purchasing view in Material Master Record are Purchasing group, order unit, Plant-specific material status, Material freight grp etc.
(In the general data, purchasing group, plant specific material status, autom.PO, batch management are some of the fields. Of course, base unit of measure, order unit, material group are displayed from the basic data.
in purchasing values, purchasing value key is a field.)

In other data, Quota arrangement, source list are some of the fields.

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Why we use document types in SAP?

Different document types are used to differentiate business transaction.