The branch of science which focuses on the formation and classification of soil is known as soil science. Some of the branches of soil science are pedology, soil zoology, soil physics, soil ecology, soil chemistry, etc. With new techniques being introduced in the field, new discoveries and researches continue to expand our understanding of soil. Such selected concepts that redefine the subject matter have been presented in this book. It will prove to be immensely beneficial to agronomists, students and researchers associated with this field.