Jank is flaws or poor-quality processes that cause slow reaction times for software or that obstruct user activities. Most of these are concerned with the rapidity or fluidity of interface performance manipulation. This phrase has gained use over time for discussing the operation of a software application or interface and the level of quality included in it. A jank-free rolling interface scrolls seamlessly and responds instantly to user events. On the other hand, jank is when the scrolling interface is choppy or slow, leading to a negative user experience.