This book is a detailed and comprehensive medium helping students and researchers to understand cell-cell interactions. It describes various cell activities occurring within and outside the cells. Cell interactions are essential for the proper working of various organ systems. Cell adhesion, tissue regeneration, cellular interactions, metastatic cancer etc. are some of the activities and interactions occurring in human body. Some important features such as developmental, immune and neural cell interactions in both healthy as well as diseased states and state-of-the-art cell interactions assessment methods have also been discussed. This book will serve as a great resource to the scientists and professionals working in this domain.