COMPUTER FUNDAMENTALS

Detailed explanation-1: -A single processor can run only one instruction at a time: it is impossible to run more programs at the same time. A program might need some resource, such as an input device, which has a large delay, or a program might start some slow operation, such as sending output to a printer.

Detailed explanation-2: -A dual core processor can fetch and execute two instructions in the same time it takes a single core processor to fetch and execute just one instruction. A quad core processor has four cores and can carry out even more instructions in the same period of time.