General liability and completed operations
General liability pays for bodily injury and property damage you cause to others during the work: a dropped tool that injures a homeowner, a water line cut that floods a neighbour's unit, a fire started by a torch. Completed operations extends that to damage that shows up after the job is done and paid for, which is where a contractor's real long-tail exposure lives. A deck that collapses two summers later, or a plumbing joint that fails behind drywall, is a completed operations claim.
The form's exclusions matter more for contractors than for most businesses. The policy does not pay to redo your own faulty work; it pays for the damage that work causes to other property. Some carriers add exclusions for residential construction, for work on condominiums, or for damage caused by subcontractors, and those exclusions are the first thing a general contractor's contract review will reject.