When choosing a web host, there are many factors to consider: storage space, bandwidth, speed, technologies and software, and of course, price. But another crucial factor that must not be overlooked is reliability. A reliable web server will have 99% or better uptime. Uptime is the measure of what percent of the time the host is up and running, or accessible to the internet. The most reliable web host will have nearly no downtime whatsoever, that is, it is accessible 24/7. It is important to have a reliable web host, particularly when downtime means lost sales, lost ad views, or lost readers. Here is a guide to the most reliable web hosts.