In the Teaching-Learning process, the teaching aids constitute a key factor in the didactic process. they favor that the bidirectional communication that exists between the protagonists can be established in a more affective way.
Various components are involved in this communication process, such as: the information, the message, the channel, the sender, the receiver, encoding and decoding. In communication, when the change of attitude that occurs in the subject, after interacting with these components, is lasting, we say that learning has occurred.