The brain of the computer

== == Well, the computer does not have a brain like humans but it can do certain operations like math and logic in the CPU (Central Processing Unit) and it stores data in the hard disk.

If you were asking about the physical location of it:

* The CPU is under the heat sink which is the big metal piece covered by the fan. * The hard disk looks like a meta and plastic box in the front end of the case connected by a flat wire (IDE) and 4 wire with different colors.