When importing Data into CRM a specific template is required in order for CRM to map the date to the correct fields. Every entity in CRM has a specific template, and the template can be exported for future imports.
This process can be used to export templates to use when importing data such as Price Lists, Products, Accounts etc
When Importing Data into CRM it is best to use the Templates for each specific entity. This ensures that all the fields available for that entity is in the Import File.