This introductory textbook on the general theory of relativity presents a solid foundation for those who want to learn about relativity. The subject is presented in a physically intuitive, but mathematically rigorous style. The topic of relativity is covered in a broad and deep manner. Besides, the aim is that after reading the book a student should not feel discouraged when she opens advanced texts on general relativity for further reading.

The book consists of three parts:

1. An introduction to the general theory of relativity.
2. Geometrical mathematical background material.
3. Topics that include the action principle, weak gravitational fields and gravitational waves, Schwarzschild and Kerr solution, and the Friedman equation in cosmology.

The book is suitable for advanced graduates and graduates, but also for established researchers wishing to be educated about the field.