Backend Development refers to the server-side development of web applications and is responsible for handling and processing the data and logic that powers the application. The backend is responsible for storing, managing, and retrieving data from a database, performing business logic, and serving APIs that the frontend can consume. Backend developers work with server-side technologies like Node.js, Ruby on Rails, PHP, Python, and Java to build scalable, secure, and high-performing web applications. They also work with databases like MySQL, MongoDB, and PostgreSQL to store and retrieve data, as well as with cloud platforms like AWS and Google Cloud to deploy and manage their applications.