Provide an explanation or reason; 'it is that', 'the thing is', 'the reason is'.
Long explanation:
The ~んです grammar point is used to provide an explanation or reason for a situation or action. It can be translated as 'it is that', 'the thing is', or 'the reason is' in English. The formation differs depending on whether it is used with a verb, い-adjective, な-adjective, or noun.