Dialogues are usually pre-recorded before the visuals are even animated at the pre production stage. They act as a guideline for the animators to animate the lip movements of the characters. Once done, these voices are synced with the animated visuals. This process is also called Lip-sync animation. It is the best way to achieve precise synchronization between image and sound. Voices give distinct characteristic to each individual character, also tell us about the character's situations and conditions (emotions and feelings). And it brings liveliness to the characters.