A digging machine is a type of heavy machinery used to excavate and move earth. The most common types of digging machines are excavators, backhoes, and steam shovels. Excavators are large machines with a cab, boom, and bucket that can be used for digging, lifting, and moving material. Backhoes are smaller machines with a cab, boom, and bucket that are used for digging and moving material. Steam shovels are large machines with a cab, boom, and scoop that are used for digging and moving material. All three types of digging machines are used in construction, mining, and other industries.