This book is addressed to high school and undergraduate students who have very strong interest in mathematics, especially on the field of mathematical analysis and calculus.The book is written in a friendly way, containing examples and exercises accompanied by solutions, making the subject attractive.The material is organized in 166 pages, a reasonable length for someone who wants to learn and enjoy at the same time.Here are some contents of the book: functions, proofs, derivatives, integrals, minimum and maximum values, sequences, vectors, multivariable functions, matrices and determinants