Bridge Shield helps you with connecting all the shield in to one single device. Some of the shields has the connectors only from one side od the shield due their functionality like for example Smablo Gesture Shield or Top LED and Buttons Shield Smablo developed shield that helps you to add more shields together. As you can see on the pictures below Smablo bridge shield has a single connector to the CPU shield which can be either connected to the Smablo CPU Shield or to Smablo Development Board.
The example use of the bridge shield was shown on the video below.
You can also use Bridge shield to connect multiple shields to the development board similar like it was done in the PM Sensor example.