• Cache memory is a very high-speed semiconductor memory that can speed up the CPU.
• Cache memory acts as a buffer between the main memory and the CPU.  It holds the most frequently used part of the program and data.
  • Some advantages of cache memory are –
  • For temporary use, it is helpful in storing data.
• It is faster than the main memory.
• Additional Information
• Cache memory holds only those data and instructions that are held by the primary memory or main memory on which the computer is currently working.
• For storing data/information permanently secondary memory also known as external memory or non-volatile is used.

Source: Lucent’s Computer