Robot Framework is an open source test automation framework that can be used to test web, desktop, and mobile applications. It uses a keyword-driven design and has a modular architecture that makes it easy to extend with custom test libraries. Some benefits include being highly reusable, accessible for beginners, and having powerful logging capabilities. However, it does not support while loops or nested for loops, and working with non-string data types can be complicated. The framework operates independently of the system under test and uses test suites made up of test cases that can each be in their own namespace. Custom keywords, variables, and extensions are usually stored separately.