This introductory course is for students doing pre-calculus mathematics or algebra 2, or anyone wanting to upgrade their knowledge of mathematics. It explains everything you need to know about the basics of relations and functions: what relation is, what a function is, and when a relation is, or isn't a function. Easy to follow guidelines are provided to enable you to become a power learner of mathematics, which in turn promotes the mastery learning of key concepts. The course contains detailed video lessons, comprehensive lesson notes, extensive reinforcement exercises with fully worked solutions. The course concludes with a quiz, complete with detailed answers, for testing your knowledge and understanding of these essential mathematical ideas.