The solids which permit the chemical reaction to occur efficiently and cost-effectively are known as catalytic materials. Catalysis is defined as the process in which the rate of chemical reaction is increased by adding a substance called a catalyst. There are two kinds of catalytic reactions, namely, heterogeneous catalysis and homogeneous catalysis. Electrocatalyst is a form of heterogeneous catalysis whereas homogeneous catalysis is further divided into organocatalysis, photocatalysts, and enzymes and biocatalysts. Some of the industry applications of catalysis are energy processing, bulk chemicals, fine chemicals and food processing. The objective of this book is to give a general view of the different areas of catalytic materials, and its applications. It is a compilation of chapters that discuss the most vital concepts and emerging trends within this field. This book includes contributions of experts and scientists which will provide innovative insights on this area of study.