What is FileVault?
A feature built in to in Mac OS X, FileVault provides 128bit AES encryption of all files located within your home directory. After enabling FileVault (screenshot) verify that all of your applications are stored in a folder outside of your Home directory. For example, if you have an application on your Desktop, place it in your /Applications folder. This will mitigate the typical performance losses associated with encryption. Rest assured that if your Macintosh is stolen, no one will be able to peruse through your personal data!

A person has to be careful with FileVault. As my laptop goes with me everywhere I had it enabled, and more than once it has randomly mangled my home directory. If you use it make sure you keep backups elsewhere.
Is it not very good, should i not download it?
Used filevault and now have encryption problem. Anyway to undo Filevault. Did not back up, and will lose it all.
How do you download FireVault? and does anyone know how to reset there password as i only got mac today thanks, if you did would be a GREAT help. Thanks
You don’t need to download Filevault, it’s included in Mac OS X. Go to System Preferences and Security.