The correct answer is: D. Fast memory used for data that is accessed often.
Cache RAM is a small amount of high-speed memory that is used to store data that is frequently accessed by the CPU. This allows the CPU to access data more quickly, which can improve the performance of the computer.
Option A is incorrect because cache RAM is not used for overflow from your Hard Disk. Cache RAM is used to store data that is frequently accessed by the CPU, not data that is stored on your Hard Disk.
Option B is incorrect because cache RAM is not a place to store secret information like passwords. Cache RAM is used to store data that is frequently accessed by the CPU, not secret information.
Option C is incorrect because cache RAM is not the same as your Hard Disk Drive. Cache RAM is a small amount of high-speed memory that is used to store data that is frequently accessed by the CPU, while your Hard Disk Drive is a large amount of storage that is used to store all of the data on your computer.
Option E is incorrect because cache RAM is a real thing that is used in computers.