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Main benifits of a Virtual Machine?

I'm just thinking about what could I do with one if I built one. I have enough parts to build a few more machines... I think; ....so I was just thinking about it.
 
From my amateur perspective...

You can run multiple servers on 1 machine
Use it for safe web browsing
Use it to run O/Ss for non compatible programs
Use it as a portable computer. All you need is the client software on the foreign machine, and your virtual machine files.
 
Testing things, depending on the VM software, maybe old games. I use them on occasion in OS X to run software that only runs in Windows (when I don't want to reboot). I used them heavily at school, but that was years ago.
 
lol yea virtualbox.
if you have to think that hard about why you need one...you don't need one.
you can fool around with different o/s in a window for kicks without the hassle of a full install. but other than that you might find it a bit useless unless you have a technical reason for needing a vm
 
All what has been mentioned.

Also, redundancy. With more advanced setups such as ESX with vSphere, you can have a VM farm, and if one server goes down, the VMs can run off another server. You can live migrate VMs off a specific server, then turn it off to do maintenance, without affecting the VMs.

Another benefit is better use of resources. Why have 10 hardware servers that are way underloaded when you can have 1 server running those 10 servers, and have no performance hit? This is especially true when you have old NT servers that can't be upgraded due to some proprietary app on it, so you can P2V it into a VM, then get rid of the old hardware, which if it fails, you can't get parts for it. Actually that's another advantage, less hardware. Instead of having 50 physical servers you can have maybe 5.

I'm talking more from a server point of view, but plenty of fun things to do client side too such as use it to build test environments or simply try out a new OS or learn it.

For example I have a win7 VM I have so I can play around with it to try and familiarize myself with the OS. I'm sure as people bring me computers to fix, I will start seeing more win7 ones so I'll have to be able to know the OS.

Plenty of other stuff too.
 
Add Deployment. You can configure a system/software and then give the "file" to the end user and it's ready to go.
 
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