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Not all Websites need consistent maintenance. Those that hope to acquire and maintain traffic to their sites or whose information is consistantly changing can benefit from monitoring the visits to their various pages and enhancing content accordingly. These types of Websites can profit greatly by understanding what information potential customers are viewing and enabling the webmaster to better tune to maximize exposure and streamline content.
As a general rule of thumb you can say that the more important the need to increase and maintain customers the more important is monitoring and maintenance.
Maintenance can be performed in several ways.