USB
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Universal Serial Bus is an industry standard, developed by USB Implementers Forum, for digital data transmission and power delivery between many types of electronics. It specifies the architecture, in
The four wires/contacts of a USB 1.x or 2.0 cable with Standard-A plug.
Two USB 3.0 Standard-A receptacles (left) and two USB 2.0 Standard-A receptacles (right) on a computer's front panel
An early USB mass-storage device (flash drive) with a USB-A type connector
An M.2 (2242) solid-state-drive (SSD) connected into a USB 3.0 adapter connected to computer
USB hardware
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The initial versions of the USB standard specified connectors that were easy to use and that would have high life spans; revisions of the standard added smaller connectors useful for compact portable
USB
…devices; the latest versions of the standard extend the power delivery limits for battery charging and devices requiring up to 240 watts as defined in USB Power Delivery (USB-PD) Rev. 3.1 V1.1 in 2021. Over the years, USB(-PD) has been adopted as the standard power supply and charging format for many mobile devices…
Various legacy USB connectors along a centimeter ruler for scale. From left to right: Micro-B plug Proprietary UC-E6 connector used on many older Japanese cameras for both USB and analog AV output Mini-B plug (inverted) Standard-A receptacle (inverted; non-compliant because official USB specifications do not allow for extension cables) Standard-A plug Standard-B plug
Prohibited USB extension cable, plug on the left, receptacle on the right. (USB does not allow extension cables. Non-standard cables may work but cannot be presumed reliable.)
A yellow charge-only "USB" Type-A receptacle and a USB 3.0 Type-A receptacle, both upside-down, on a front panel with card reader
A blue Standard-A USB receptacle without USB 3.0 contacts fitted