A doodle is a type of sketch, an unfocused drawing made while a person's attention is otherwise occupied. They are simple drawings which can have a meaning, a shape or just irregular forms.
Doodling is mainly made by young people around the world, notably students. This activity is normally made during long or boring classes as the students begin daydreaming or losing interest. They do it mainly on the notebook margins or in the back pages starting as random lines and sketches and then becoming more elaborated.
Doodling can also be made while talking by telephone for a long period of time if a pen and paper are available.
Popular kinds of doodles include cartoon versions of teachers or companions in a school, famous TV or comic characters, invented fictional beings, landscapes, textures, banners with legends, and animations made by drawing a scene sequence in various pages of a book or notebook.