Excavators are heavy construction equipment consisting of a boom, bucket and cab on a rotating platform sits atop an undercarriage with tracks or wheels. excavators come in a wide variety of sizes. The smaller ones are called mini or compact excavators. The mini excavator is more practical than the traditional excavator because its small size facilitates maneuvering in small places and offers the advantage to reach places that larger machines cannot. The main uses for an excavator are digging trenches, holes, and foundations, excavate or move large objects.