Core ResponsibilitiesServer-Side Logic: Write code that processes user actions, like logging in or making a purchase.Database Management: Design and manage systems that safely store, update, and retrieve data.APIs (Application Programming Interfaces): Create bridges so the user-facing part of an app can talk to the server.Security: Protect sensitive data and set up rules to block unauthorized access.Performance: Optimize speed and handle heavy traffic so the site does not crash.Common Tools and LanguagesLanguages: Python, Java, JavaScript (Node.js), PHP, and Ruby.Frameworks: Django, Spring Boot, and Express.js.Databases: MySQL, PostgreSQL, and MongoDB