Data may be performed within the register and arithmetic logic operations.
An address stored in the register may be used to point to a memory location, i.e. address.
It can be used to read and write data to the computer peripheral equipment.
Their respective roles
register
effect
EAX
Storing a result obtained after a program is finished
even
As a counter, such as the number of execution of this command will read rep from the ECX register
EDX
In certain arithmetic overflow as EAX register, such as multiplication, and division operations
EBX
As generally used memory offset pointer (relative to the EAX, ECX, EDX)
EBP
It is also used as a pointer register. Typically, it is used to build high-level language compiler 'stack frame' to save the local variables or process
