Home exchange, also known as house swapping, is a form of lodging in which two parties agree to offer each other homestays for a set period of time. Since no monetary exchange takes place, it is a form of barter, collaborative consumption, and sharing. Home exchange can cover any type of residence including apartments, houses, holiday cottages, boats, or recreational vehicles. It can include an exchange of the entire home or just a room. The length of the swap can vary from a weekend to over a year. The swap can be simultaneous or non simultaneous. Home exchanges are usually arranged via specific types of social networking services, most of which charge a fee.