The Modifiers menu provides a way to apply frequently used modifiers quickly.
The availability of items on this menu depends on the current selection. If a modifier doesn't apply to currently selected objects, it is unavailable in the menu.
Edit/Convert
Selection
Spline
Geometry (Convert to Mesh)
Geometry (Parametric)
Free Form Deformers
Confom
NURBS
Patch
Animation
Cloth
Hair and Fur
Simulation
Cameras
Subdivision Surfaces
UVs, Maps and Materials