RAM or Random Access Memory is a form of data storage in computer/laptop/mobile. This type of memory is very fast which is in contrast to the hard disc which is relatively slow. A RAM allows a operating device to read and write data almost instantaneously. More the RAM, faster will be the device. More RAM can handle multitasking easily.
First RAM- William tube
Highest RAM in smartphone- 10 GB
Smartphone having highest RAM- Oneplus 6T McLaren Edition (10 GB)