A hoist is a mechanical device that is used to lift and lower heavy objects or loads. It is typically made up of a motor, a gearbox, a brake system, and a lifting mechanism such as a chain or wire rope. Hoists can be powered by electricity, air, or hydraulics, and are commonly used in industrial settings such as manufacturing plants, construction sites, and warehouses.

Trolleys, on the other hand, are devices that are used to move objects along a track or rail system. They are often used in conjunction with hoists to transport heavy loads horizontally, and can be manually operated or powered. Trolleys typically have wheels or rollers that run along the track, and are designed to support the weight of the load being transported.

When used together, hoists and trolleys can provide a flexible and efficient lifting and transport solution for heavy objects. For example, a hoist can be used to lift a load off the ground, and then a trolley can be used to move it horizontally to its final destination. This can be particularly useful in settings where space is limited or where it is difficult to maneuver heavy loads manually. Hoists and trolleys can also be used in combination with other lifting equipment such as cranes and jibs to provide a complete lifting solution for a wide range of applications.