Manners are important because they are how we show respect for other people. For example, when someone gives you a gift, or does you a favour, it is considered good manners to say 'thank you'. Saying 'thank you' shows that you understand the gesture was done out of the goodness of that other person's heart, and that you appreciate it. If you do not say 'thank you', then it gives the impression that you think the person owed this gift or gesture to you, and that you are therefore better than them. This is offensive.
Similarly, if you do something that could be considered offensive (for example, passing wind, wich subjects others around you to a bad smell), it is considered good manners to say 'excuse me', and at least pretend to be embarassed. This shows that you regret making the person or persons around you experience something unpleasant, and wish for them to not hold it against you.
Put simply, manners help you give the right impresson of you being a decent sort of person, and keep you from unintentionally making enemies.
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