Robot Framework is a generic open source automation framework. It can be used for test automation and robotic process automation (RPA).
Take an example, you made a website for a client according to their requirement and now you need to check whether the client requirement has been fulfilled or not. So in this case you need some person to check all the features of the website as per the requirement. This process will take time and there may be a chance where the person who is checking all the features may be missed some features to check. So here robot framework comes into picture.
Robot Framework is open and extensible and can be integrated with virtually any other tool to create powerful and flexible automation solutions. Being open source also means that Robot Framework is free to use without licensing costs.
Robot Framework has easy syntax, utilizing human-readable keywords. Its capabilities can be extended by libraries implemented with Python or Java. The framework has a rich ecosystem around it, consisting of libraries and tools that are developed as separate projects.