Jam tracks, aka. backing tracks, are recordings of a band playing music without the lead guitar part, so you can practice playing along and coming up with your own melodies. You'll soon discover that it's way more fun practicing lead guitar with a band than playing all by yourself.
To learn how to use this helpful and fun tool, simply follow this link: https://www.guitartricks.com/blog/how-to-use-the-guitar-tricks-jam-station
To access the Jam Station, go to your Toolbox: https://www.guitartricks.com/toolbox.php