Sometimes called "no loop." The lines (legs) are widely separated. This is produced by waving the rod so that the tip moves in an exaggerated convex path.
This type of loop takes a lots of energy to cast. It is not recommended to practice this technique in windy situations, it may end up in a disaster. This technique may be used while casting heavy flies or weighted rigs for nymphing, but if you don’t know how to control the shape then you won’t be able to take advantage of this technique benefits when the situation calls for it.
Sometimes called narrow loop. The lines (legs) are close together and parallel, produced by an almost straight line path of the rod tip.
This type of loop requires less energy to control. A tight loop is extremely efficient in wind and enables you to present your fly with pin-point accuracy. The energy used in this loop is mostly uni-directional and has high line speed. Tight loops can be really fun to cast.