This document provides an overview and introduction to the book "Nursing Theories and Nursing Practice" which aims to assist nursing students and practicing nurses in exploring and appreciating nursing theories and their application to practice. The book is divided into sections on overview of nursing theory, most commonly used theories today, and emerging theories. Each chapter describes a nursing theory and its use in practice, research, education and other areas. The book highlights influential early nurse theorists and the roots of theory development over the past 50 years.