Which animation principle is aimed at enhancing the fluidity of a character’s movement?

The principle focused on enhancing the fluidity of a character's movement is slow in and slow out. This principle involves gradually accelerating and decelerating an object's motion, instead of starting and stopping abruptly. By incorporating slow in and slow out, animators create a more natural and lifelike movement, as it mimics how objects in the real world tend to move. For example, when a character jumps, they might ease into the jump (slow in) and then slow down towards the peak before accelerating back down (slow out). This technique adds a sense of weight and realism to the animation, making the character's actions more believable and visually appealing.