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

Surveys are a standard tool for empirical research in social sciences, marketing and official statistics. Online (Internet) surveys can become a research tool for a variety of research fields, including marketing, social and official statistics research. wikipedia.org

Technical support or tech support refers to a range of services by which enterprises provide assistance to users of technology products such as mobile phones, televisions, computers, software products or other electronic or mechanical goods.

Email marketing is directly marketing a commercial message to a group of people using electronic mail email. wikipedia.org

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

Phone technical support refers to a range of services by which enterprises provide assistance to users of technology products such as mobile phones, televisions, computers, software products or other electronic or mechanical goods via telephone.

A sale is the act of selling a product or service in return for money or other compensation. It is an act of completion of a commercial activity. wikipedia.org