What is the origin, authenticity and relevance of Tantra?

From: SHIVA RAMA KRISHNA MERUGU

Hare krsna prabhuji, dandawath pranam. so many times our acaryas quoted TANTRAS to give descriptions about navadvip dham and mother srimati Radharani. can you please tell about the origin and authenticity of TANTRAS? Can this TANTRAS are applicable for all the ages? Please explain prabhuji. Thank you very much.