What is the difference between adult coloring books and children's coloring books?

What is the difference between adult coloring books and children’s coloring books? Here is the detailed answer.

COOL Paw-Patrol Coloring Book:100 Premium Coloring Pages For Kids

Printing Coloring Books for Adults, Teens, and Children

Coloring Pages to print (101 FREE pages!)

animal coloring pages for adults

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Make a colouring book in 10 minutes to entertain your kids for hours

Make a colouring book in 10 minutes to entertain your kids for hours

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Are there coloring books specifically for left-handed people?