Difference between GOOGL and GOOG?

In M1, I see two separate stocks for the same company... they even have different values and growth. What is the difference, and which should I use?

https://imgur.com/a/StHGX

Picture to clarify, thanks!

Submitted February 12, 2018 at 05:19PM by bstephe123283 http://ift.tt/2Bqix2M