Most computers and smart devices are enabled with Adobe Reader and some browsers such as FireFox has a PDF reader built into it. If not, it is very simple to get and free to download.
Adobe Reader for Computers: GO HERE
There are many apps for smart devices, but below are some examples.
Adobe Reader by Adobe for mobile devices: GO HERE
Adobe Reader for Apple Devices: GO HERE
Adobe Reader for Android Devices: GO HERE
Adobe Reader for Windows Devices: GO HERE