A data entry clerk, sometimes called a typist, is a member of staff employed to type data into a database using a keyboard. The keyboards used can often have specialist keys and multiple colours to help them in the task and speed up the work. wikipedia.org

A secretary, or administrative assistant, is a person whose work consists of supporting management, including executives, using a variety of project management, communication & organizational skills. wikipedia.org

Office administration is a set of day-to-day activities related to financial planning, billing and recordkeeping, personnel, and physical distribution and logistics, within an organization. wikipedia.org

Order processing Order processing is a key element of Order fulfillment. Order processing operations or facilities are commonly called "distribution centers".

Customer service is the provision of service to customers before, during and after a purchase. wikipedia.org