The Rubik's Cube was invented by Erno Rubik, A professor of architecture, in 1974. It has since become the Worlds best selling toy ever made, with roughly 300,000,000 sold.
The Rubik's cube has exactly 43,252,003,274,489,856,000 possibilities. It is advertised as having "Billions" of combinations, but that's because it'd confuse people if they said "43 quintillion". It is solvable in any position, so long as the cube's stickers aren't tampered with, in twenty four moves or less.
There are several different ways to solve the cube. From optimized intuitive methods, like the Heise and the Petrus, to rote memorization, like the Fridrich and the legendary Zboroski-Bruchem method. In fact, solving the cube has become so easy that people have solved it blindfolded!
The Rubik's cube may seem difficult at first, But give it a shot. If you try hard enough, it becomes rediculously easy.
Solving the cube:
The Lar's Method
The Fridrich System
The Heise Method
The ZB method