The common fixing is the all-purpose version made of plastic, also called the 'Wall Plug'. 

When used in concrete or hard masonry, it expands to create a snug fit. In hollow cavity masonry or prefabricated slab materials like plasterboard or wood materials, it fastens to the material when the screw is inserted. 

But, other fixing types are also suitable for use with hollow cavities, such as toggle or spring fixings made of plastic or hollow cavity fixings made of metal. These types have enlarged surface areas, which makes them better able to distribute the forces acting upon them. If you plan to hang heavy objects on a wall or from a ceiling, you would be better served by these specialised fixings.