Software is actually executed on the system board. The CPU is the brain of the computer. The CPU clock speed tells us how many operations the CPU can make in one second. While the CPU's speed isn't the only thing that determines how fast the computer runs your software, it is a major influence on the computer's overall speed. If the power goes off, the computer's RAM resets itself a blank slate.
Memory is most often measured in megabytes, a megabyte is one million bytes.
The more memory the better off the computer is. Drives Drives provide the permanent storage areas for your computer. When the computer is turned off, all of the parts except for the drives are wiped clean. Drives use electric motors to spin disks and require power directly from the power supply. The Floppy Drive allows you to store information on floppy disks.