New Edge/Face from Vertices
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This is a context-sensitive tool which creates geometry by filling in the selection. When only two vertices are selected it will create an edge, otherwise it will create faces.
The typical use case is to select vertices and press F, yet Blender also supports creating faces from different selections to help to quickly build up geometry.
The following methods are used automatically depending on the context.
N-gon from Edges
When there are many edges Blender will make an n-gon. Note that, this does not support holes, to support holes you need to use the Fill Faces tool.
Existing edges are used to make the face as well as an extra vertex.
Sometimes you may have many connected edges without interior faces.
When there are many isolated vertices, Blender will calculate the edges for an n-gon.
Single Vertex Selection
With a single vertex selected on a boundary, the face will be created along the boundary, this saves manually selecting the other two vertices. Notice this tool can run multiple times to continue creating faces.
Dissolve Existing Faces
When you have a region of existing faces, creating a face on this selection will remove the shared vertices and edges, creating a single face.
This is simply a convenience for accessing Dissolve Faces.