Quick Charge 4.0 is a fast charging technology developed by Qualcomm that allows compatible devices to charge significantly faster than standard charging methods. It can deliver up to 100W of power, enabling devices like smartphones and laptops to reach a full charge in a fraction of the time. This technology also includes features like USB Power Delivery support and improved thermal management, which helps prevent overheating during charging. Additionally, Quick Charge 4.0 is backward compatible with previous versions, ensuring that users can still benefit from faster charging even with older devices.