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Back-end development refers to web development activities that occur at the program's back end. In contrast to frontend development, which focuses on customer-facing services and programs, backend development encompasses server-side web application logic and integration and activities like writing APIs, creating libraries, and working with system components. Backend developers write the code that lets an application and a database talk to each other. Backend developers control what you don't see and take care of the website's backend, which includes databases, servers, and apps.