DDP and Incoterms are both abbreviations - where DDP stands for "Delivered Duty Paid" and Incoterms is an abbreviation of International Commerce Terms. Incoterms is a collection of internationally acceptable terms, or standardized trading terms, that regulate the division of responsibilities between buyers and sellers when transporting goods. DDP is one of these conditions.
In DDP Incoterms, the seller is defined as the liable party during the entire transport process, until the goods are ready for unloading at the consignee. This means that the seller is responsible for all costs and risks associated with the transport - including customs clearance in both the country of dispatch and the country of destination.