Incoterms are a set of international trade terms published by the International Chamber of Commerce to provide a standard way of interpreting the costs, risks, and obligations of trading partners. There are 13 main terms divided into 4 groups - EXW, FCA, FAS, FOB (seller's minimum responsibility); CFR, CIF, CPT, CIP (seller arranges and pays main carriage); DAF, DES, DEQ, DDU, DDP (arrival terms where seller is responsible for delivery). Incoterms define responsibilities for transportation, insurance, customs clearance, and other costs and risks involved in international trade transactions.