Evan Abrams shows how to create the popular twitch and slide motion effect in After Effects with focus on the relationship between keyframes that produce the twitch and ease motion, demonstrating the quickest way to achieve this effect.
The twitch and slide movement is for bringing in new elements and making rapid changes less jarring
Evan notes that you most likely have seen this animated style around, because it is a great way to make fast changes in movement less jarring, and he also notes that it is useful for synching animation to music and emphasizing beats.