The Selenium framework is a suite of automation testing tools that makes code maintenance easy and efficient. Usage of frameworks provides beneficial capabilities such as increased code reusability, higher portability, the reduced maintenance cost of the script, better code readability, etc. Usage of frameworks eliminates the repetitive manual testing that takes lots of time and effort.
If you are interested to learn Selenium, I recommend this Selenium Certification course by Intellipaat.
You can watch this video on Selenium Training to understand more: