Back-end development is the term used to describe tasks carried out during the execution of programs on the web. Instead of frontend development, which focuses on customer-facing services and programs, backend development handles server-side web application functionality and integration as well as activities like designing APIs, creating libraries, and working with system components. Backend programmers create the code that enables database and application communication. Backend developers are responsible for looking after and maintaining a website’s back end, which includes databases, servers, and apps. They are in charge of what you cannot see.