Lifting a huge weight off the ground requires a ton of different muscles to work in sync. When you get your form right, you'll be able to lift more weight and protect yourself (somewhat) from injury. This tip helps to wake up all the right muscles for a strong deadlift.
This video from Breaking Muscle gives the details, but the key move is squeezing your knees into your elbows before you start the lift. That helps you to activate muscles in your butt and thighs, so that those muscles are on the scene and ready to work when the weight leaves the ground. If you don't activate those muscles, it's easy to straighten your legs too soon, leaving your back to do too much of the work.
A reminder: it's possible to hurt yourself with big lifts like these, and you can't expect to learn a brand-new lift from a video or two. So if you've never tried before, get a qualified trainer to help you learn. (Or if you must try it out, start very light, with just the bar, or even a broomstick.) Check out the link below for more information on how this tip can improve your deadlift.
A Simple Cue to Immediately Improve Your Deadlift [Breaking Muscle]