CPU or microprocessor

a CPU is a complete computer engine on a single chip, it's where the calculations take place. the first CPU was called the Intel 4004 and it was introduced in 1971.
The speed of the CPU has increased dramatically. in 1974 the clock speed was 2 MHz which is 2 million cycles per second and in 2004 the clock speed increased to 3.6 GHz which is 3.6 billion cycles per second.
according to dictionary.com MIP's measure the computer and is 1 million instructoins per second.
a duel core processor is a CPU that has 2 execution cores with one chip. multitasking is when you have different programmes running at the same time. a duel core processor is really good for multitasking because each of the execution cores are independent so the operating system has enough resources to handle the different tasks.
the Intel Atom Processor uses less power, is really small but it allows a "big internet experience" which is good for people who use their mobile phones to go on the internet unlike the traditional way of using the computer.