Memories.

Flash memory Is given its name due to the way in witch it works, it was first used by toshiba who used a large current To force electrons through a barrier to trap them in a layer on the other side of the barrier until they reset.this 'flash' gives us the name. Flash memory is a removable memory in a wide range of devices. The most we widely use is USB sticks. Even though it being a ssd with no moving parts makes it reliable, although after lots of writing and rewriting it may deteriorate. Flash memory makes a low cost portable and removable storage. 

Virtual memory is a section of  the hard drive that creates a virtual space for program's and things to be stored in.

Cashe memory is memory located either on the CPU or nearby, on the motherboard. This memory acts as a buffer for the CPU, it stores recently used data so it can access it quickly . The CPU always checks the CPU first.

Ram is volatile so when its turned off nothing is stored, it takes files from the hard drives and gives them access to the CPU.  Static ram takes up more ram on a chip, and dynamic ram constantly refreshes.

The more ram available the more program's and data can be used at the same time.