In the computer there is a precise hierarchy with regard to the memory, according to their speed and size.
On a computer there are basically three types of memory: the hard drive, the RAM and the processor cache. These memories can be ordered according to the characteristics above, and then, in a hypothetical pyramid, we find at the bottom the hard drive (slow but with a lot of space, in the order of terabytes) in the center there is the RAM (fast, but with little space in the order of gigabytes) and the top there is the cpu-cache (fast but extremely small, ranging from kiloByte to megabytes).
This was true before the introduction of SSD (Solid State Disk), which led to an increase in performance in the area of HDD (though obviously not yet comparable with the RAM), one of the ways to accelerate certain processes bypassing the disc, it to use the Ram Disk.
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