How to burn or mount an ISO file?

I have downloaded an ISO file recently.

How do I burn it to a CD or DVD or mount it?

how-to using ubuntu

Brasero is a application to burn CD/DVD for the Gnome Desktop. It is designed to be as simple as possible and has some unique features to enable users to create their discs easily and quickly.

K3b (from KDE Burn Baby Burn) is a CD and DVD authoring application for the KDE desktop environment for Unix-like computer operating systems. It provides a graphical user interface to perform most CD/DVD burning tasks like creating an Audio CD from a set of audio files or copying a CD/DVD, as well as more advanced tasks such as burning eMoviX CD/DVDs. It can also perform direct disc-to-disc copies. The program has many default settings which can be customized by more experienced users. The actual disc recording in K3b is done by the command line utilities cdrecord or cdrkit, cdrdao, and growisofs. As of version 1.0, K3b features a built-in DVD ripper.

If you use GNOME see this to make it look native

how-to using ubuntu

Or you could mount the iso file directly in ubuntu.

sudo mkdir /media/iso
sudo mount -o loop myIsoFile.iso /media/iso

Unmount with:

sudo umount /media/iso/