What is relative adverbs?
Hey Sagar!
Though, for the term you have questioned, there is no official definition in my knowledge, I am providing you with the best I can.
When the interrogative adverbs ‘where’, ‘when’ and ‘why’ join two clauses in a sentence, they become relative adverbs.
Examples:
1. This is the place, where the accident took place.
2. That was the time, when I used to play for my college football team.
3. This is the reason, why I decided not to attend the party.
Hope this helps.
All the best!