Not All Tablet Styluses Are Equal: Capacitive, Wacom, and Bluetooth Explained
 

More and more Android and Windows tablets are advertising their styluses. They’re popular iPad accessories, too. But not all styluses are equal. The technology built into your device’s touch screen will control what kind of styluses you can use.

Knowing the difference is important when shopping for tablets. For example, if you’re a digital artist, a Surface Pro 2 offers a much better stylus than a cheap Dell Venue 8 Pro, even though they may both be advertised as having styluses.

http://www.howtogeek.com/177376/not-...oth-explained/