In short
DAP is an Incoterms rule under which the seller delivers goods to the destination named by the buyer, bearing transport cost and risk until then.
Under DAP, import customs clearance and duties are the buyer's responsibility; goods are delivered ready for unloading at the destination. Quotes usually state it with the place (e.g. DAP Mersin).
Incoterms rules clarify how cost and risk are shared in quotes and contracts.