When you begin to look for a company to host your website, other than the amount of space and bandwidth that is offered, a company will usually promote their web hosting uptime. Most web hosting companies offer an uptime guarantee to promote how well their service is. Web hosting uptime is a measurement of the time a computer server has been running, the longer the web hosting uptime the better the service (usually). Uptime is important to not only web hosting companies, but to any person or company that has a website, because if a website is down it could hurt a personal company’s reputation as well as the reputation of the web hosting uptime guarantee. Web hosting companies strive for a 99.9% uptime, which means that there would be less then 2 minutes of downtime a day.

Factors that impact a web hosting uptime are sometime unavoidable, but many companies strive to prevent downtime. Downtime can be classified in three ways: planned downtime which is caused when a server is updated or upgraded, semi-planned downtime which is caused when software companies find a security breach and a patch must be put into place, and the worst is unplanned downtime which can be caused by an overloaded server, a software/hardware malfunction, or malicious software. Uptime guarantees made by web hosting companies are based off of past information. Web hosting uptime can be monitored and maintained a few ways.