「店」 (mise) means "shop" or "store." It's a general term for any establishment where goods or services are sold to customers. You can find many kinds of 「店」, like a bookstore, a clothing store, or a cafe.

「店(みせ)」は、物(もの)を売(う)ったり、サービスを提供(ていきょう)したりする場所(ばしょ)のことです。