Above is a picture of Google's new logo. How is it different you ask? Well the L and the second G have moved by a few pixels. Before the bottom of the L didn't quite line up with the bottom of the E. And the second G has been moved over one pixel to make the spacing more even. Gizmodo published an article about all the different logo's Google has had. You can read about it here and see the gif of the difference between the old and new logo. The article also goes into the importance of kerning and invites you to do a Google search of what kerning is. Google responded to the original Reddit Thread that caught the logo change saying that they are glad people notice even the slightest pixel changes.