Concurrent forces are forces that all go through one point of intersection. When forces are concurrent, all vectors can be added together to obtain the resultant. If the forces are in equilibrium, the resultant will be zero.
In order to find out whether vectors are concurrent, there must be a body for the force to act upon. The body is a point in space. A typical example is a cable attached to an eye screw. If there is only one cable and the body is suspended, the forces of gravity and the cable will be concurrent. All forces on a suspended load are concurrent.