Document Types allow you to use a more structured approach to manage your documents. Using Document Types, you can store specific indexing information with each document (for e.g. store Invoice Number, Invoice Date, Invoice Amount with each stored Invoice and store Sender Name, Date with each stored Letter).  For more info see Data Fields.

The main advantage of this approach is that detailed information about each type of added document can be captured by creating very specific data fields. Doing this also increases the number of ways you can look for documents

Sohodox by default ships with some common Document Types such as Invoice, Checks, Letters and Email. You can modify these Document Types by adding or removing data fields. You can delete any of these Document Types and create a new set of Document Types more suited for your organization.