MacBook Pro: "Apple's line of MacBook Pro laptops was intended for the professional and power users. The MacBook Pro line includes the MacBook Pro 15' Core Duo, MacBook Pro 15' Core 2 Duo, MacBook Pro 15' Unibody, MacBook Pro 17' Core Duo, MacBook Pro 17' Core 2 Duo, and the MacBook Pro 17' Unibody.
The MacBook Pro laptop was first introduced in January 2006; it replaced the PowerBook G4, Apple's earlier professional line of laptops. The original MacBook Pro model came in an aluminum enclosure, a trend that continues with this line of laptops today.
After more than two years and numerous incremental upgrades, Apple announced a completely new MacBook Pro model in October 2008, dubbed the MacBook Pro 15' Unibody. The MacBook 15' Unibody is a distinct update of the original MacBook Pro, packing all the previous features of the Pro into a more stylish and lighter weight aluminum enclosure"