Is memory stored even after power is disconnected?

This question is about random access memory. For example, when the a computer is suspended, I know that data is stored in ram for quick reload. But, when power is disconnected, either by power failure or simply unplugging it from the wall, is that data completely lost? Or is there enough energy stored in the computer to keep that memory intact? I know that old projection monitors would store a bit of power but I never knew why. So if there's an explanation for that, I'd be thankful for the info.