Your back muscles are large and important, providing functional strength and stabilizing the skeleton for every day and intense movement and exercise. The back muscles include the Latissimus dorsi (lats), the rhomboids, the teres and quite a few others.
Strong back muscles help protect you against musculoskeletal back injury, which is rife in the modern world. For that reason alone, building and maintaining strong back muscles is important.
Here are my top targeted exercises for the back.
See a more detailed guide to weight training practices and procedures here.