Which memory type is fastest and is typically located inside the CPU?

Which memory type is fastest and is typically located inside the CPU?

کون سی میموری کی قسم سب سے تیز ہے اور عام طور پر سی پی یو کے اندر واقع ہے؟
Explanation

Cache memory is the fastest system memory, required to keep up with the CPU as it fetches and executes instructions.