These names are often used interchangeably to describe similar objects. The differentiation between a hot tub, jacuzzi, and home spa can mainly come down to how the systems are branded. The Jacuzzi brand is owned by the Apollo Management Group which also owns sundance spas, hydro pool, dimension one spas, and thermal spas. Hot tubs can go by a variety of brand names but ultimately serve the same purpose in acting as a type of hot tub. The clearest way to understand the difference between a spa, jacuzzi, or hot tub is to consider the differences between coca-cola and Pepsi, or ford and Ferrari. Both are similar in nature but have different identifiers which make them unique.