The main purpose of a speech bubble in a graphic novel is to show what the characters say.
Explanation:
Speech bubbles, also called speech balloons, dialogue balloons or word balloons, represent the most common way of showing what the characters say in comics, cartoons, and graphic novels. There are different types of speech bubbles, as shown in the picture below:
- the first one indicates that character is speaking neutrally
- the second one indicates that the character is whispering
- the third one shows the character's thoughts
- the fourth one indicates that the character is yelling.
The bubble that conveys thoughts is often referred to as a thought bubble.
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