An inverter is an electronic device that converts direct current (DC) into alternating current (AC). This process is essential for using battery power, such as from solar panels or batteries, to run household appliances that typically require AC power. Inverters come in various types, including pure sine wave and modified sine wave, each suited for different applications. They are commonly used in renewable energy systems, such as solar energy setups, and in uninterruptible power supplies (UPS) to provide backup power during outages.