The main difference between DRAM (Dynamic Random Access Memory) and other types of memory, such as SRAM (Static Random Access Memory), is the way they store data and their performance characteristics.

1. Data Storage: DRAM stores data in capacitors, which are tiny electrical storage cells. These capacitors need to be constantly refreshed to retain the stored data. SRAM, on the other hand, stores data in flip-flops, which do not need to be refreshed.

2. Speed: DRAM is slower than SRAM in terms of access time and data transfer rate. This is because the process of refreshing the capacitors takes time, which slows down the overall performance. SRAM, being static, does not require refreshing and therefore has faster access times.

3. Density: DRAM is more dense than SRAM, meaning it can store more data in a given physical space. This is because the capacitors used in DRAM are smaller and can be packed more tightly. SRAM, with its flip-flops, requires more space per bit of storage.

4. Power Consumption: DRAM consumes less power compared to SRAM. This is because the constant refreshing of capacitors in DRAM consumes less energy than the constant power requirement of flip-flops in SRAM.

5. Cost: DRAM is generally cheaper to produce than SRAM. The manufacturing process for DRAM is simpler and less expensive, making it more affordable for large-scale memory applications.

6. Volatility: Both DRAM and SRAM are volatile memory types, meaning they lose their data when power is removed. However, DRAM requires constant refreshing to retain data, so it is more sensitive to power interruptions. SRAM, being static, does not require refreshing and is more resilient to power loss.

Overall, DRAM is commonly used in computer systems as main memory due to its high storage density and lower cost. SRAM is often used as cache memory, which provides faster access to frequently used data in the CPU.