Cache-

Advantages
1. Faster than main memory
2. Consumes less access time than main memory
3. Stores the program that can be executed within a short period of time
4. Stores data for temporary use

Disadvantages
1. Limited capacity
2. Very expensive

Primary Memory (Main Memory)-

It is a volatile memory with low capacity, in which data can be lost, when power is switched off.
Characteristics:
1. These are semiconductor memories
2. It is also known as Main Memory
3. Usually volatile memory
4. Data is lost when data is switched off
5. It is the working memory of the computer
6. Faster than secondary memory
7. Computer cannot run without primary memory

Secondary Memory (External Memory)-

It is a non-volatile memory, where data remains, even after the power is switched off.
Characteristics:
1. These are magnetic & optical memories
2. It is also known as Backup Memory
3. It is a non-volatile memory
4. Data is permanently stored even after power is switched off
5. It is used for storage of data in computer
7. Computer may run without secondary memory
8. Slower than primary memory