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memory bus is also called an address bus or front side bus and both busses are high speed digital superhighways. Access methods and speed are two of the fundamental technical differences between memory and mass storage devices. All memory sizes and storage capacities will inevitably be exceeded with advances in technology over time.
Cache memory is a special type of internal memory used by many central processing units to increase their performance or throughput. Some of the information in the main memory is duplicated in the cache memory, which is slightly slower but of much greater capacity than the processor registers, and faster but much smaller than main memory. Multi level cache memory is also commonly used. Primary cache is the smallest, fastest and closest to the processing device. Secondary cache is larger and slower, but still faster and much smaller than main memory.
Semiconductor memory uses semiconductor based integrated circuits to store information. A semiconductor memory chip may contain millions of tiny transistors or capacitors. Both volatile and non volatile forms of semiconductor memory exist. In modern computers, primary storage almost exclusively consists of dynamic volatile semiconductor memory or dynamic random access memory. Since the turn of the century, a type of non volatile semiconductor memory known as flash memory has steadily gained share as offline storage for home computers. Non volatile semiconductor memory is also used for secondary storage in various advanced electronic devices and specialized computers.