Energy monitors are devices that track and display the amount of electricity consumed in a home or business. They help users understand their energy usage patterns, allowing them to identify areas where they can save energy and reduce costs. Many energy monitors connect to a smartphone app, providing real-time data and insights. These devices can measure energy consumption from individual appliances or the entire electrical system. By using an energy monitor, users can make informed decisions about their energy habits, contributing to both environmental sustainability and lower utility bills. Popular brands include Sense and TP-Link.