seller

In its primary sense, a seller is the active agent in a transaction. While 'vendor' often feels more formal or commercial (like a street vendor or a software vendor), 'seller' is the neutral, universal term for anyone parting with an item for money. When used to describe a product (e.g., "a strong seller"), the focus shifts from the person to the market performance. It carries a connotation of success, demand, and commercial viability. The word lacks inherent emotional charge; it is neither positive nor negative, though in legal or contractual contexts, it represents one side of a binding agreement opposite the 'buyer'.