Claw-foot bathtubs, or freestanding bathtubs, have been around for more than a century. Originally, these tubs were made of cast iron, which requires extra floor support for the tub, but today, they are made of lightweight materials, which means the but doesn't require additional floor support.
A recessed tub is the traditional tub, which is found in many homes and is most commonly made of enamel steel. This tub is surrounded on three sides by the tub alcove, which is most commonly comprised of three of the bathroom walls.
Corner tubs are characterized mainly by the triangular shape of one end of the tub. Generally, these tubs are finished on all sides, except the corner end.
Jetted tubs, often referred to as whirlpool tubs, feature powerful jets that can be turned on and off at the bather's option. These are available in indoor, outdoor, single person and multiple-person models.
Drop-in tubs are mounted on an even plane with the floor. Sometimes, a deck is built in the bathroom to accommodate a drop-in tub and some tubs are actually sunk below the level of the floor.
People who aren't able to get into a traditional tub, such as those requiring a wheelchair, may find that a walk-in tub is a good option. These tubs feature a door that becomes fully sealed when closed to prevent water leakage. These tubs may feature seats as well.
Some tubs are classified by the materials used to make them, which include stone, glass or wood. These designer tubs are usually custom made but some home improvement stores sell basic models.