In a narrow connotation, the term 'occlusion' relates to the arrangement of maxillary and mandibular teeth and to the way in which teeth contact. Thus, a simple definition of occlusion includes such terms as 'the static relationship' or 'any contact' between the incising or masticating surfaces of the maxillary and mandibular teeth or tooth analogues'. In a broader context, however, the definition of the term 'occlusion' is not limited to morphological tooth contact relationships.This book can be guiding step for the professionals and the young budding dentists to understand the basics as well as the importance of occlusion.