A good example of when you would use a live session is if your computer turns on and won't boot, you can run the live session. You could then mount the disk and backup all of your pictures or send an email. If your hard drive or SSD is no longer working, you can boot a live session and then order replacement parts. You also can feel free to try different things out in a live session and not worry about breaking your install. A live session is also good to see if you have misconfigured something that broke it or confirm that is a problem always without configuration changes.
A good example of when you would use a live session is if your computer turns on and won't boot, you can run the live session. You could then mount the disk and backup all of your pictures or send an email. If your hard drive or SSD is no longer working, you can boot a live session and then order replacement parts. You also can feel free to try different things out in a live session and not worry about breaking your install. A live session is also useful to see if you have misconfigured something that broke it or confirm that is a problem always without configuration changes.
..warning::
In a live session anything you do not save to external media or a mounted drive specifically will be lost when you power off your machine.
