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A live web site, meaning one that is uploaded to the web host’s server, is visible as long as the hosting server is working properly. If you have ever typed a URL into your web browser of a web site that you know exists, but the browser shows a 404 error page instead of the homepage the site was probably experiencing some downtime. Most web hosts advertise a 99.7% uptime, meaning they have a .3% of the year in which they will be scheduling downtime to service the servers that contain your web site files. With viruses, natural disasters, etc. it would be almost impossible for any host to guarantee 100% uptime. The trick is to find a reliable host who has protected themselves from outside factors and schedules server maintenance in non-peak site viewing times and communicates to users ahead of time when they will be doing maintenance.

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