It will allow you to search youtube for backing tracks on a desired root note, specific styles (jazz, blues, rock, pop, etc) or scales (major, minor, pentatonic, etc).
Just plug your android device and play guitar along! Practice scales, arpeggios, chords, harmony, or your tab reading skills using the back tracks that are available.
You can bookmark your favorite videos for later use and check the last played ones.
So, install the application and jam along!