The Lenovo laptop adapter is a device that converts and regulates electrical power from an AC source to a DC power output suitable for charging and powering Lenovo laptops. These adapters come in different wattages and connector sizes to fit different laptop models. They typically feature LED indicators to show power status and protection against over-voltage, over-current and short circuits. A genuine Lenovo adapter ensures reliable performance, safety, and compatibility with the laptop it is designed for. Non-genuine adapters may cause damage to the laptop and even pose a safety risk.