Computer users have many choices for web browsers. It is not unusual to find some computer users who have multiple web browsers installed on their computer; while some use different browsers for different purposes, most keep multiple browsers because they know one of the first steps for troubleshooting a malfunctioning web site is to use a different web browser. Web browsers are installed on smartphones as well. Be aware that the web browsers on mobile operating systems (iOS or Android) do not have all of the features of browsers for full operating systems.