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Memory sticks are computer parts that can be addressed by the CPU through the bus and read and write operations. Memory sticks have historically been an extension of main memory. With the continuous update of computer software and hardware technology, memory sticks have become the whole of read and write memory. What we usually call the size of computer memory (RAM) refers to the total capacity of memory sticks.
Memory sticks are an essential part of computers, and the CPU can address memory through the data bus. Historically, computer motherboards had main memory, and memory sticks were extensions of main memory. There is no main memory on the motherboard of future computers, and the CPU is completely dependent on memory sticks. The contents of all external memory must pass through memory to function.