This is a web based on-line calendar. You can enter details of appointments and then view them in daily, weekly, and a number of other formats. But it really starts to get useful when you have a number of people on Google Calendar. You can set up authorisation for specific people to have view / update / or full control of your calendar. You can book meetings with other people and they can accept or reject these appointments. At the click of a button you can overlay calendars on top of each other.
It is a really powerful product, with similar features as Microsoft exchange, but without the associated high costs that go with Exchange.
Worth a look at by all small business owners needing a computer based calendar.
Why not see what it can do by visiting the “Google Calendar tour” website: