A teacher uses learning instructional facilities to make learning

Teaching-learning materials break complex ideas into concrete forms, so their main purpose is to make learning simple and easy.

"More knowledgeable" is vague, since aids clarify rather than merely add knowledge.

"Quicker" is a side effect, not the core aim of using aids.

"Interesting" is desirable, but simplification of content is the primary function here.

Aids appeal to more than one sense, aiding comprehension and retention.

Edgar Dale's Cone of Experience ranks such aids from concrete to abstract.