Backend frameworks are pre-built structures that provide developers with a good basis for building server-side components. They provide a structured environment with predefined libraries, modules, and tools, speeding up development and improving maintenance and scalability. Top 10 backend frameworks are Node.js, Express.js, Django, Flask, Ruby on Rails, Laravel, ASP.NET Core, Spring Boot, Phoenix, and GraphQL. Each framework has its advantages and disadvantages, so the best choice depends on the specific needs of your project.