Quite often people provide information over the Internet using ISO images. ISO is an archive/image of an optical disc. ISO images are typically used to store structured data files for storing on CD/DVD ROM discs. The ISO file format allows for easy storage, transportation and replication of CD/DVD ROM discs.
One way to use CD/DVD images is creating copies on CD/DVD disks. Here you can find how to do that. But also there is a lot of software providing the possibility to mount CD/DVD image as virtual CD/DVD drive. According to my experience, one of the most powerful programs with intuitive graphic user interface is Alcohol 120% of Alcohol Software. Free trial version of this software is downloadable from http://www.alcohol-soft.com.
Don't use this information for creating illegal copies of CDs/DVDs.
Download Alcohol 120% from http://www.free-downloads.net/downloads/Alcohol_120
Run installation executable, then follow instructions.
After installation is completed, start Alcohol 120%.
On the left pane, click Virtual Drive, Alcohol 120%. An Options dialog box appears.
Select Number of Virtual Disks as 1 (or more if you need more virtual disks). Press OK button.
On the bottom pane, new Virtual DVD/CD-ROM appears. Click the name of Virtual DVD/CD-ROM by using the right mouse button. The Context menu appears--select Mount Image.
Open My Computer on Windows. You will find that new CD/DVD drive appears in your system.
Open this new CD/DVD drive. Now all data stored in ISO image is available.
Please notice that this works for Windows OS only.