Condos differ from time shares. In a condominium, you own 100% of a unit and everything inside the boundaries of that unit is your responsibility (repairs, damage, upgrades, etc). You also have exclusive access to that unit (nobody else can use it, unlike a time-share).

You own a fraction of the land that the building sits on, and a fraction of the "common areas" (lobby, swimming pool, parking lot, etc). You are responsible for contributing for the maintenance of those areas, or paying assessment fees to a management company that will take care of those areas.