Scissor lift is just a platform that can be elevated to a height with the help of metal supports or metal railings. These are generally known as operational lifts. Generally the scissor lifts are restricted in their movement, i.e. they can move only vertically and hence for requirements that require the person to move upwards is where these extend a helping hand. But there are also other aerial platforms that are bigger and versatile in their operations and can move in any direction as directed by the operator from the ground. The underlying mechanism in any of these is the pressure that is put on the outside support from the ground that pushes the folded arms to pop-up and raises the platform to the required height. This pressure enlarges the platform and the decent might not require any extra pressure but just the release of the exerted pressure would bring the platform down. Again this will happen slowly and steadily.