Bathtubs are usually divided up into two main types: drop-in and alcove. Choosing between these types can be a challenge, but it's important to understand the key differences to help you decide. Put simply, an alcove bathtub is one that is installed in an alcove of the bathroom, against the walls. A drop-in bathtub, meanwhile, can be installed anywhere, right in the middle of the room if you want, without visible plumbing. Drop-in tubs offer more aesthetic advantages than a typical three wall alcove bathtub, but they're usually much more expensive and trickier to install. Plus, they can be harder to get in and out of, making them less suitable for elderly people or those with mobility issues.