JTAG (Joint Test Action Group)

JTAG (Joint Test Action Group) is a standardized method used to test and debug electronic devices, especially printed circuit boards (PCBs) and integrated circuits (ICs). It provides a way to access and control the internal components of a device through a dedicated set of pins, enabling technicians to check connections, verify functionality, and diagnose faults without physically removing parts. JTAG is also used for programming microcontrollers and FPGAs. Essentially, it acts as a digital interface that helps ensure electronics work correctly and can be efficiently repaired or tested during manufacturing and development.