Backend development involves building the server-side of websites through activities like writing APIs, creating libraries, and working with system components to ensure data integrity and consistency. A backend developer writes code to communicate with databases, builds effective website architectures, and needs skills in areas like data structures, programming languages, frameworks, databases, version control, and cloud hosting platforms. Key roles include backend developer, full stack developer, and devops engineer, with responsibilities like programming, testing, organizing system logic, and ensuring performance and security compliance. Backend developers focus more on technical skills while backend engineers take a more strategic, big-picture approach. The frontend is what users interact with directly, using languages like HTML, CSS, and JavaScript, while the backend is