In public speech, the purpose of a speech refers to the main goal the speaker or author wants to achieve with the audience or the main reason that motivates the speaker to deliver a presentation or speech. Most common purposes include to narrate which is used to tell fictional or non-fictional events; to entertain which is used to amused the audience; to explain which is about providing information for the audience to understand a topic, idea or situation and to persuade, which is about convincing the audience of believing an idea or doing an action.
Additionally, the purpose is usually linked to the type of content of the speaker addresses, in this way the purpose of speech that is aimed to entertained is linked to interesting or funny content while the content of a speech whose purpose is to persuade is linked to some specific idea or action. Considering this, in the case of a speech that addressed the importance of adopting a school-wide recycling program the purpose would be "to persuade" because the speaker is trying to convince the audience about some specific idea and motivated them to take action, which is exactly the purpose of persuading.
Its important because if you dont respect yourself how are you going to respect others a respect is important in the adult world because if you dont respect your boos he wont respect you and chances are that he might even fire you for that so this is my answer to your question
