Why use FileVault instad of login

Hi, I'm confused about the difference between FileVault and having a regular login. To me, it seems that they both do the very same thing. So what's the difference, and why should I bother with FileVault?

Awesome, thanks for your help
I have a few more questionmarks before I'm satisfied It would be great if you guys could help me with those as well...
1. Does FileVault make my computer safer over the internet as well? I understand that it helps when I'm logged out, but does FileVault do anything for me when I'm logged in?
2. When I enter the FileVault-password at the login-screen, does this decrypt the encryption or is the system still encrypted?
3. Is OS X still encrypted when I use the operatingsystem, or only when it's on the login screen? If it's still encrypted while I'm using OS X, then what happens to files that I share? For exemple, are files i share with drop box encrypted for other users?
4. Will my computer perform worse with FileVault active?
5. Is there anyway to use FileVault on additional discs, or does it only work with the startup disk?
6. Does anything actually happen with OS X after I activate FileVault, or does it function in the same exact manner?
Thanks for all your assistance.

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