Back-end development in full-stack web development involves building and maintaining the server-side of a web application, focusing on the functionality and logic that powers the application behind the scenes. Back-end developers work with databases, server-side languages such as Python, Ruby, Java, or Node.js, and frameworks like Django, Flask, Ruby on Rails, or Express.js to handle data storage, retrieval, and manipulation. They are responsible for implementing business logic, authentication, authorization, and other core functionalities that drive the application's behavior. Back-end developers ensure the security, scalability, and performance of the server-side components, often working closely with front-end developers to integrate the front-end and back-end systems seamlessly. Their role is essential in creating robust, efficient, and reliable web applications that meet the needs of users and businesses alike.

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