Portable power supplies are compact devices designed to store and provide electrical energy for various applications. They typically use rechargeable batteries and can power small electronics like smartphones, laptops, and cameras. These supplies are especially useful for outdoor activities, emergencies, or when access to traditional power sources is limited. Many portable power supplies come with multiple output options, including USB ports and AC outlets, allowing users to charge or run different devices simultaneously. Some models even feature solar charging capabilities, making them ideal for camping or off-grid adventures. Overall, they offer a convenient solution for staying powered on the go.