You choice of bindings will be dictated by the type of board and boot you are using.
Freestyle bindings go with soft boots and are strapped into the bindings by adjustable clips.
Step-in bindings are a recent innovation, allowing the boarder to lock in just by stepping on to the board.
Step-in boots are similar to soft boots but slightly heavier, as they contain attachments on the sole to link into the bindings.
Alpine boards, which are less popular with all-round boarders, use ski-style boots and plate bindings.