What does the fillet command create?

it hepls to  join two unconnected line whict are right angled. it can be square or curved.

A fillet is an arc that create tangent between two objects.

Fillet commands creates round corners. A fillet connects two objects with an arc that is tangent to the objects and has a specified radius.

Fillet is a command in autoCAD which connect two lines with both sharp and curved corners by giving the fillet radius.

Fillet using for corners .Its an arc that create a tangent between two lines

it is used to make arc connection between two intersected lines 

Fillet command when applied to provide the connection between two non parallel intersecting lines/ planes . we can also applied this command on edges of surface to make it smooth....

2 LINE  BETWEEN GAP FILL THE LINE

If used on 2 lines it connects them. If on 2 polylines it will make them into one polyline. Fillet with 0 radius value creates an edge , while fillet with radius value creates a curve or arc at the point of intersection between the 2 lines or polylines.

fillet is using Joining to 2 unparellel lines 

Fillet used  to joining 2  unparalleled lines it connects them. If on 2 polylines it will make them into one polyline.