authorized dealer; official distributor; agency
Refers to a retail outlet or distributor that has a special contract with a manufacturer or supplier to sell its products, often with exclusive rights or official status.
I bought this car at an authorized dealer.
Our company is recognized as the official distributor for that region.
代理店 is a general agent or agency, while 特約販売店 specifically implies a special contract for sales, often with exclusive rights.
正規販売店 is an authorized retailer, but 特約販売店 emphasizes the special contractual relationship, which may include exclusivity.
Compound of 特約 (special contract) + 販売 (sales) + 店 (shop).