As the name suggests, back-office refers to the functions which are required to be carried out efficiently to ensure the success of the business, but these services do not fall into the core operations functioning of the firm. You can outsource this part of your company to an external service provider. Mostly it is about written customer service and office activities.
For example the processing of e-mails, letters, and faxes. Complex activities such as payroll accounting, data processing in ERP systems, or order processing are also part of the back office.