Can someone explain the harmonic oscillator for beginners?

[Erbil]

Hi ! There's a lot of information about Harmonic Oscillator.But I'm just a beginner of physics.And my English is not excellent to understand all informations in the Internet.Is there anybody,who can explain me Harmonic Oscillator?

 

[Pengwuino]

http://en.wikipedia.org/wiki/Simple_harmonic_oscillator

Done.

 

[Erbil]

thank you.And I want thanks also,who makes Java applets...
http://www.phy.hk/wiki/englishhtm/SpringSHM.htm