The PL011 UART is the main UART for models without Bluetooth feature and is tied directly to the Linux console output. However, you only have one pair of TXD and RXD pins to work with.
Technically, the Raspberry Pi has two UARTs: PL011 UART and mini UART. Note that these pins use 3.3V logic levels so you can’t connect them directly to devices that uses 5V like an Arduino UNO or a PC. The Raspberry Pi UART transmit (TXD) and receive (RXD) pins are assigned to GPIO14 and GPIO15 respectively: Introduction to Raspberry Pi Serial Ports This Raspberry Pi Serial tutorial teaches you how to utilize the board’s UART feature in order to connect to a PC or to other microcontrollers and peripherals. The serial port is a common way to “talk” to devices and is a feature that most microcontrollers and computers have.
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