Answer:
infinity stones are from the mcu franchise (marvel universe) and they are gems that represent different aspects of existence. There are 6 of them and they represent the Mind, Power, Reality, Soul, Space, and Time. These gems posses a lot of power (a lot is an understatement) and in the wrong hands, they are deadly to the existence of humans. I won't go into the details of infinity war/endgame since that is technically spoiling.
Explanation: