A Timeshare is a form of ownership or right to the use of a property, or the term used to describe such properties.
The basic timeshare concept is simple: you pay a one time purchase fee that entitles you to a week every year (or sometimes every other year) at a resort. Instead of renting your vacations, you now own them. Due to the upfront costs, and the fact that the majority of timeshares do not appreciate like normal real estate, the cost savings is in future vacations.