Static RAM (SRAM) and Dynamic RAM (DRAM) are two types of random access memory used in computer systems, with different characteristics in terms of speed, power consumption, and cost.

SRAM uses flip-flops to store each bit of data, while DRAM uses a capacitor and transistor to store each bit. SRAM does not need to be refreshed like DRAM, which requires refreshing to keep its data intact.

SRAM is faster and more expensive than DRAM but consumes less power. It is commonly used for cache memory, a high-speed memory that temporarily stores frequently used data that the CPU can access quickly. DRAM, on the other hand, is slower and less expensive than SRAM but consumes more power. It is typically used for main memory, a larger and slower memory to store the operating system and other programs.

Another key difference between SRAM and DRAM is their density. SRAM has a lower density than DRAM, requiring more physical space to store the same data. This makes SRAM less cost-effective for large memory applications, while DRAM is more cost-effective due to its higher density.

In summary, SRAM is faster, consumes less power, and is more expensive than DRAM. It is commonly used for cache memory. DRAM, on the other hand, is slower, consumes more power, and is cheaper than SRAM. It is typically used for main memory.