Which of the following is a common type of retail store format?

A specialty store is indeed a common type of retail store format. Specialty stores focus on a specific category of products or a specific market niche, which allows them to offer a wide selection within that category. This targeted approach enables them to develop a deep understanding of their products and cater to a distinct customer base. Customers often visit specialty stores for expert advice, unique products, and a curated shopping experience, contributing to strong customer loyalty.

Other formats mentioned, while they are also influential in the retail landscape, do not align as closely with the common definition of a retail store format. Supercenters, which combine grocery and general merchandise, represent a hybrid format. Warehouses usually pertain to discount outlets focusing on bulk and low prices, while online marketplaces encompass an entirely digital environment where various retailers sell their products, diverging from traditional brick-and-mortar formats.