What is memory explain different types of internal memory in detail.

Memory is the part of the computer system that is used to store data or instructions temporarily or permanently.
Types of internal memory are:
1.RAM ( Random Access Memory): RAM is the read-write memory both, the Information can be written into the RAM and read from the RAM. CPU can access any memory location in a random Sequence without going through any other memory location. It is a volatile memory (i.e.) it stores data or information as long as the power supply is on when the power supply goes off, the stored content in the RAM will be lost.
2. ROM ( Read-only memory):
It can be used only to perform the read operation, it doesn’t have writing capabilities. It is a non-volatile memory the information stored in it is permanent and is not lost even if the power supply is down. It is used for the permanent storage of programs. ROM is Cheaper than RAM On a per-unit basis but when comparing on the basis of Storage capacity ROM is more expensive than RAM.
3. Cache Memory: Cache memory pronounced as cash, is a special high-speed and expensive Semiconductor memory placed between RAM and CPU. It is used in the CPU.So that CPU doesn’t have to wait for data to be delivered. The most frequently used instructions are kept in the cache memory so that the CPU can look there first. This allows the CPU to run faster because it doesn’t have to take time to swap instructions in and out of RAM. In general, the cache has two levels Level 1 (L1) and Level 2 (L2). In which (L1) is smaller and the faster among the two and (L2) is larger but slower.