An excavating machine is a type of heavy machinery used to dig and move earth. It can be used for a variety of purposes, such as digging trenches, ditches, and foundations for buildings. Common types of excavating machines include dredges, ditch diggers, backhoes, dredgers, and steam shovels. Dredges are used to remove sediment from the bottom of a body of water, while ditch diggers are used to dig trenches. Backhoes are used to dig large holes, while dredgers are used to move sediment from one place to another. Steam shovels are used to scoop up large amounts of material, such as rocks and soil.