Provides an explanation or gives background information; 'the fact is', 'the reason is', 'actually'.
Long explanation:
The ~のです grammar point is used to provide an explanation or give background information on a situation, often used when there is a need to justify or clarify one's statement. It can be translated as 'the fact is', 'the reason is', or 'actually' in English. The formation differs depending on whether it is used with a verb, い-adjective, な-adjective, or noun.