There are mainly two types of RAM

1. SRAM
2. DRAM

SRAM

SRAM is the short form of Static Random Access Memory

DRAM

DRAM is the short form of Dynamic Random Access Memory.

There are mainly 5 types of DRAM

1. SDRAM – Synchronous DRAM
2. ADRAM – Asynchronous DRAM
3. RDRAM – Rambus DRAM
4. CDRAM – Cache DRAM
5. DDR SDRAM – Double Data Rate SDRAM

Currently, There are mainly five types of DDR SDRAM

1. DDR1
2. DDR2
3. DDR3
4. DDR4
5. DDR5