There are two different types of loose connections, both of which are described below.
The two stars on this board shows which positions can be used to break the threat of a loose connection:
These are the same places at which the horizontal player wants to place additional pieces in order to connect the blue pieces.
This connection is a bit weaker than Type I.
The blue player threatens to connect the pieces by either playing c1 or b3:
which form two bridges between the original pieces.
The obvious way for the red player to stop the blue is to play either b2 or c2: