2) Functions of teaching aids
a) Helping understanding
Sometimes it may be difficult for the audience to imagine the situation, etc. by just listening to oral explanation
but they may understand it at once by looking at a picture or illustration. For example, you can imagine easily that
a person who does not know about aircraft would understand what an aircraft is more quickly by looking at its
photo or an animated film than hearing an oral explanation. This way, teaching aids can help the audience with
understanding.