Stopbands are ranges of frequencies where a device or material stops certain frequencies from passing through.
Stopbands are important for controlling which frequencies can pass through a device or material.
Examples:
The stopbands in the filter prevent certain sounds from coming through.
The sunglasses have stopbands that block some of the sun's light.
The stopbands on the window glass stop some of the heat from coming in.
The stopbands in the wall keep the loud music out.
The stopbands in the fence stop the animals from getting through.
The stopbands in the door keep the cold air out.