what is a ram(Random Access Memory) and what are the different types of rams

Memory means a storage area where you can store data.
RAM: RAM means random access memory.
it is a temporary memory.
it is a volatile memory.
Because till you save, the data will be copied into ram once you save the data copy from ram to harddisk which is a permanent storage device

[@M.4y]

Can someone help me to figure out how to build own nanoleafs? I want to detect with a esp32 automatic how much own panels are connected and set individual colors and animations. But how can it set automatically number up the IDs for every panels? Every panel should have 18 rgbw LEDs. I don't know which LEDs I have to choose.