Friendship is defined as a pure, disinterested affection shared between people based on trust, sharing, complementing one another, and providing support and companionship. For the speaker, friendship makes them feel joy, love, company, happiness, and fun. They describe their best friends - their mom who is funny and a good advisor, their sister who is serious but an excellent friend and helpful, Luis who is shy but very funny, and Kimberly who makes them smile and is sincere and a beautiful person. The speaker concludes that friendship is an important value for society and the world needs friendship.