If I wanted to make ubuntu apps could I download ubuntu into a vm and use ubuntu exactly the same way I use it on my computer, and what is a vm, what are it's pro's and con's?
closed as not a real question by Rafał Cieślak, Uri Herrera, fossfreedom♦ Jan 4 '13 at 21:34
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A Virtual Machine (VM) is what it says. It is a computer that is virtualized. Meaning there is no hardware directly associated with it. It uses the host computer's hardware resources to run. See this link for more information on what a VM is.
To answer what I think is the main question, yes. Once you install Ubuntu inside a virtual machine, you will be able to use Ubuntu apps and anything else Ubuntu has to offer. It will be very similar to using a physical machine.
As far as pros and cons go, I can think of a few. Mainly, the con would be that you will not get the full computing power of the host machine since you have to share resources between the two "computers". This will not be an issue if you have adequate hardware. A pro would be that you can do backups and restores of your VMs very easily.
Let me know if you would like more information on this topic.