The Google Logo is the original and most common Google Logo. Since 1997, there has been 3 official Google Logos
1997-1999[]
The 1st Google Logo had an ! at the end.
1997-1999
1999-2010[]
The ! was taken away and shadows were added.
1999-2010
2010-2013[]
The shadows are barely seen.
2013-2015[]
The shadows were removed.
Background[]
When you have a customized background, the Google logo turns white.
2010-Present
The Transparent Google logo