What's the difference between the system bus design and front-side bus design?

[Jskid]

I'm just learning about buses and it's my understanding that the system bus combined the data bus, address bus and control bus. According to wikipedia the system bus isn't used any more and the front side bus is popular. I don't really understand, what is a front side bus?

 

[Tmagic650]

Front-side_bus
Google is your friend... really!