A townhouse in Great Britain is a type of house that is attached to other houses on either side, forming a row of houses together. Think of it like a row of dominos that are all standing up and touching each other. Each townhouse usually has two or more floors, and can have a small yard in the front or back.
If you live in a townhouse, you share walls with your neighbours on either side, but you have your own space inside your house, like your own rooms and bathrooms. You might also have a garage or a driveway, which is a small space to park your car.
Many townhouses in Great Britain were built a long time ago, so they can have lots of character and unique features, like old fireplaces or wooden beams in the ceiling. Some newer townhouses are built to have modern designs and features.
Overall, a townhouse is a type of house that is connected to other houses in a row, but allows you to have your own private space inside.