What is Dual Boot?
Dual boot is like having two different operating system within 1 PC or hard disk. That can be boot separately each time you turning on your computer.
What it's advantage between dual boot and common boot?
Dual boot have many advantage. First, it can be act as back up when your Windows operating system get troubled by virus, corrupted file on system, etc. You can still open your files on the Windows from your Linux. Second, malicious software / virus / trojan become ugly when it's opened on the different based operating system. Easily said you can spot easily those ugly Windows-based viruses / trojan when running Linux operating system and deleted them! Third, you will be looking more cool when you can using both of them :) (don't mind this one, eh!)