Sometimes it happened that you need to setup windows or any other operating system in your pc but you don’t have any optical drive. If you don’t have an optical drive you cannot be able to insert a windows installation disk into your computer. So that you cannot setup windows in your pc without buying a new optical drive. But if you can setup windows in your pc using a usb pendrive or flashdrive? Yeah, it is possible to setup windows from a usb flashdrive. But normally you can not setup windows using usb pendrive of flashdrive. For this you must need to make your usb flashdrive bootable.
http://www.techfestibal.com/2017/04/how-to-make-bootable-usb-pendrive.html

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Let me save you guys the stress, google "Rufus usb bootable creator". Search for Rufus and type anything on bootable devices. Download Rufus.exe the rest is explained.