Excavation is digging, especially when you're removing something specific from the ground. It's like digging a hole or trench to find or move things like soil or rocks. There are several types of excavation methods used in construction, including trench excavation, basement excavation, cut and fill excavation, slope excavation, dredging, footing excavation, pit excavation, rock excavation, channel excavation, trenchless excavation, and underwater excavation.