The USB Power Delivery (USB PD) Specification enables the maximum functionality of USB by providing more flexible power delivery along with data over a single cable. Users need USB to fulfil their requirements not only in terms of data but also to provide power to, or charge, their devices simply, often without the need to load a driver, in order to carry out “traditional” USB functions. USB has become a ubiquitous power socket for many small devices such as cell phones, tablets, portable speakers and other hand-held devices. Today many devices charge or get their power from USB ports contained in laptops, workstations, docking stations, displays, cars, airplanes or even wall sockets. USB has evolved from a data interface capable of supplying limited power to a primary provider of power with a data interface.
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