Web site maintenance includes minor changes, updates, and corrections to existing web site content, including HTML code, graphics, and other data. Webmastering plays an essential role in maintaining a viable presence on the web … links must be monitored from time to time to insure that they are still functional (not broken) … many websites have at least some content [information] that must be freshened periodically … visitors may tend to not frequent sites that become "stale" — they will move on to more interesting things unless they have a special reason to visit your site.
As you can see, site maintenance is something that should not be an afterthought when developing your web presence. Constructing your website may just be one of the first steps taken in your "Internet strategy" for your business or organization.