I want to know the basic differences of the computer processors. When I want to buy a laptop I came across core i3 core i5 and core i7.

Is set if I have more numerical number for example I core i7 is that like that laptop is really good? What are the combinations which works with the computer processors.

core i3 core i5 & core i7 simple explained. Can anyone simply explain the differences between the core i3 core i5 and core i7?