RS-232
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In telecommunications, RS-232 or Recommended Standard 232 is a standard introduced in 1960 for serial communication transmission of data. It formally defines signals connecting between a DTE such as a
PCI Express x1 card with one RS-232 port on a nine-pin connector
USRobotics Courier external modem had a DB-25 connector that used the Ring Indicator signal to notify the host computer when the connected telephone line was ringing
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
RS-232
…Equipment and Data Circuit-Terminating Equipment Employing Serial Binary Data Interchange, issued in 1997. The RS-232 standard is commonly used with serial ports and serial cables. It is widely used in industrial communication devices. A serial port complying with the RS-232 standard was once a standard feature…
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)