About haptic feedback

It’s a tactile feedback system which uses different forces and vibrations to indicate a specific action. The best non-mobile examples that come to mind are the Xbox 360 and PS3 DualShock controllers. Various in-game actions trigger a sharp vibration in the controller. For instance, in a first-person shooter, the controller vibrates when you get shot.

In smartphones, of course, haptic feedback occurs when pressing the capacitive buttons and sometimes with other on-screen actions. For example, even with haptic feedback disabled, long-pressing on the home screen will trigger a subtle vibration.
Most people never give haptic feedback a second thought. It’s just something that happens when you press certain buttons. It’s a physical indicator that rattles your bones and lets you know you’ve pressed a button.

Note: As understood from various online sources, and learned from various tech experts. Not own words

An explanation post is due, will give all the references there in it

SwiftKey Flow: no need to lift your finger

Current offerings like Swype and others allow you to slide you fingers between the letters for a particular word, but you still have to lift off to start a new word; SwiftKey Flow alleviates this problem.

The "Flow through Space" feature means you need to just slide your digit over the space bar and then go straight onto the next word so your finger never leaves the screen as long as you want.

One more important feature is if the first word is not the one you intended, just go for the second word in between hitting the space. Almost 90 percent of  the time the first weird may get corrected.

And it is the fastest keyboard in all the keyboards I have tested (Android). It supports 3 languages at a time and knows Damn well which language you are about to use.

If you permit it, it can learn your style of language by virtue of tic social network updates. All in all, SwiftKey is a must for heavy texters.