Blogs and sites are always interested to know how many visitors are paying them a visit. This is but natural since having access to statistics pertaining to visits can provide a clear basis for performance Knowing this data can help sites improve their offering through the use of visitor widgets.
Visitor widgets does not only reveal the number of visits that happened. The data they provide can also reveal the number of unique visitors, the keyword used to find the site, the approximate physical location of the visitor and the number of pages visited in a site. Co-relating these data makes it easier for site owners to determine their points of improvement in attracting visitors.
Site owners will just have to determine what kind of widget will work best for them. Would they want their visitor data displayed on public? How much traffic tracking do they need? The choice will actually depend on how a site would like to project the visitor data that it is getting.