Selenium Framework is a suite of automation testing tools that is based on the JavaScript framework. It could run the tests directly on the target browser, drive the interactions on the required web page and rerun them without any manual input.
A testing framework in general is a set of guidelines or rules used for creating and designing test cases. A framework is comprised of a combination of practices and tools that are designed to help QA professionals test more efficiently. For details, For details, You can even check out Selenium concepts with the Selenium online training.