Difference Between Sharps, Flats, and Natural Notes

In music there are 7 main notes — A, B, C, D, E, F, G. Each one of these notes has 3 different but similar sounds to it. For example we have A-natural, A-sharp, and A-flat. If it's A natural, then you place your finger in the natural spot. If the note is marked as sharp, you play it a half step higher than the natural note. If it is marked as flat, then you play the note a half step lower than the natural note. 

Examples of Naturals Sharps and Flats