SRAM, also known as cache memory, is used to store frequently accessed data and provides faster access than DRAM. There are three main types of cache memory: L1, L2, and L3. Dynamic temporary storage, such as SDRAM, GB PATA, and SDLT, is the core function of computer memory. EEPROM is a type of memory that can retain stored data even when powered off. Flash memory, such as USB sticks and memory cards, was developed from EEPROM and also retains data when powered off. Adapter cards provide expanded capabilities to computers by adding functions like networking, graphics, and sound.