Why is there a notch in some chopping axes?

The notch in some chopping axes, often referred to as a "bit," serves multiple purposes. It helps to reduce the weight of the axe, making it easier to swing, while also ensuring better balance and control during use. Additionally, the notch can assist in chip removal and improve the efficiency of the cutting edge by allowing for deeper penetration into the wood. This design feature enhances the overall performance of the axe during chopping tasks.