This document provides an introduction to educational research. It defines educational research as a formal, systematic process to solve problems related to education through careful investigation. The characteristics of educational research include investigating both the science and art of education through testing hypotheses, correcting errors, and suggesting improvements. Educational research has historically developed in four phases from before 1900 to the present day. The document outlines different types of research such as basic research, applied research, and action research. It also discusses the need for educational research and some limitations to educational research, such as the complexity of studying human behavior and difficulties in observation, replication, and measurement.