The most obvious difference between a deadlift barbell and hex bar is the shape. Whereas the standard deadlift barbell is a classic, straight bar, the hex, or trap, bar has a (quite self-explanatorily) hexagonal shape.  The unique hexagonal shape is meant for you to position the bar around your body, with you in the center. Then, by bending at the knees, you can grip the bar on either side of you, and lift straight upward. This is quite possibly the best option for those struggling with their form, as it prevents you from lifting too much with your lower back.  Hex bars are also designed to reduce the amount of pressure on your lumbar spine, enabling even those with back problems to continue participating in their weight-lifting passion. This can make it a useful rehabilitation option, though you should always consult with a sports physician when recovering from any injury - especially a back injury. The hex bar also allows a neutral grip with palms facing inward toward the sides of the body. This can make it easier to handle heavier loads vs. a straight bar, as the grip is stronger in the neutral position. Remember, when lifting a classic barbell, you don't only need to pull the bar up, but you have to resist your body from falling forward. This is because, as you bend down in a conventional or sumo deadlift the weight is (obviously) in front of you, throwing off your center of gravity. As you lift, you must restore your natural center of gravity as you work to pull the weight from the floor.  The hex bar does not require this, and instead, demands only that you pull the weight up and only up. This can be a huge relief to your back and is a good solution to those not lifting in competitive settings.