There is no denying that Windows OS is widely used than MacOS. This is the reason; manufacturers of USB drives and external hard drives Format their devices to Ntfs by default. 

NTFS stands for NT file system, originally developed by Windows and is a default file system for Windows OS. Unfortunately, Apple has not licensed for this system and Mac users cannot write to drives that come with NTFS format. Hence, there are a few things you can try to use Ntfs Drives on Mac and some of them are listed in this article.