ClockLink offers a variety of personalized clocks that can be displayed on webpages by simply adding a tag. ClockLink provides many types of clocks, including analog, animal, animation, digital, seasonal, sports, and more. The reason ClockLink offers free clocks is because it makes profits through advertisements. When you hover your mouse over the clock, the ClockLink logo or a sponsor's advertisement will appear on the clock, and clicking on the clock will link to either ClockLink or the advertiser's website. Of course, you can also become an advertising sponsor for ClockLink.