please explain in simple language the feature of perfect competitive firms i.e "freedom of entry and exit".

The concept of 'Freedom of Entry and Exit under Perfect Competition Market' has been extensively covered in our study material.

In order to view this topic, go to the Chapter-4 (The Theory of Firm under Perfect Competition), Lesson- 2 (Perfect Competition and Its Features) of Microeconomics. If still it is not clear to you, then do get back to us.