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
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
A variety of USB cables for sale in Hong Kong
Serial port
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A serial port is a serial communication interface through which information transfers in or out sequentially one bit at a time. This is in contrast to a parallel port, which communicates multiple bits
A male DE-9 connector on an IBM PC compatible computer (with serial port symbol) used for an RS-232 serial port
A female DE-9 connector on an RS-232 cable.
An IBM PC serial card with a 25-pin connector (obsolete 8-bit ISA card)
A PCI Express ×1 card with one serial port