Lasso selection is a technique of free-hand selection in which you direct the mouse pointer wherever the objects you want to select are and do not release the mouse button until all the objects are selected. You do not use a selecting rectangle but change the direction of selection as the case requires.
If you have opted for the one-click selection method, the direction of the selection changes with each time you stop the mouse but do not release the mouse button.
To use the lasso selection
A contextual edit bar appears.
The objects inscribed by the selection zone are selected.