A safety net is a net to protect people from injury after falling from heights by limiting the distance they fall and deflecting to dissipate the impact energy. The term also refers to devices for arresting falling or flying objects for the safety of people beyond or below the net. Safety nets are used in construction, building maintenance, entertainment, or other industries.

A safety net gives falling objects much more time to come to rest than hitting the hard ground directly. In physical terms, this means more time for deceleration and kinetic energy transfer, resulting in a softer landing and a much lower risk of damage.

What kind of net to be used, depends upon many factors, (such as the factors that could determine the force of the impact) such as falling objects' speed and mass. To encounter more force, a more total width of the net, is required. The minimum distance of the spot on the net at which the object is impacted, and the edge of the net (nearest edge), matters, and is to be kept more than a certain limit. There is a role of materials used to make the ropes of the net (such as an iron rod grid will not work as well as flexible and extensible ropes), and the tension or stretch used to make the net (stored in the ropes), also have some roles. The net is to be set at an appropriate height from the hard ground, so that the object, along with the rope, does not clash with the hard ground. The mesh hole size should not be so big that falling objects/people/part of it could pass through the holes.

Construction Safety nets are used at high-rise building construction sites for preventing accidental falls of people or objects from the site. Construction safety nets are the safest and cost-effective fall prevention system in the world. Construction safety nets are flexible plastic nets made from HDPE or High-density polyethylene raw materials. Construction safety netting system is also known as debris netting which can be installed both horizontally or vertically according to the requirements. The best practice of construction netting is to wrap up the whole construction site from bottom to top, which works as a protection wall to prevent anything from falling without blocking the view. Safety net installation at any building site requires professional expertise and technical knowledge.