This document provides an overview of microgrids. It defines a microgrid as a small-scale power supply network designed to provide power for a small community using local power generation and storage. Microgrids can operate connected to the main utility grid or independently. They comprise distributed generation sources like renewable energy and thermal sources. Microgrids offer advantages like reliability, reduced emissions, and efficiency. Challenges include voltage and frequency control, storage needs, and protection schemes. Future research directions include demonstration projects and developing microgrids into intelligent energy systems.