A software program can periodically check to see if a website is down, if broken links exist, or if errors have occurred on specific pages.
Monitoring the web is a critical component for marketing, sales and product support strategies.
A web crawler can periodically scan a website to see if any changes have occurred since its last visit.
Reasons to track website changes include: This is a parallel application to the offline business of press clippings.
Fortunately, there is at least one web service (see Internet Archive) that tracks changes to most websites for free.