This is a modern, and relatively comprehensive introductory textbook on Quantum Mechanics. It is intended to correct the lack of such a book today, in spite of the ever-increasing importance of the subject in contemporary science, technology, and everyday life. With its clear, pedagogical presentation, and with many examples discussed and problems solved both analytically or with numerical methods, the book is a unique and enjoyable textbook on Quantum Mechanics, useful for physics students, researchers and teachers alike.