Question

What is the FBD diagram

Answer 1

In physics and engineering, a free body diagram is a graphical illustration used to visualize the applied forces, movements, and resulting reactions on a body in a given condition. They depict a body or connected bodies with all of the applied forces and moments, as well as reactions, that act on that/those body

Answer 2

FBD.
FBD or free body diagram of a body is an independent diagram of the object with all the forces which are acting on the object are represented