The HC-05 Bluetooth Transceiver Module is a versatile and widely used wireless communication module designed for Arduino and embedded systems. Unlike the HC-06, the HC-05 supports both master and slave modes, allowing it to either initiate or receive connections.

This module uses UART (serial communication) for easy interfacing with microcontrollers such as Arduino, AVR, PIC, and Raspberry Pi. It supports Bluetooth 2.0 + EDR protocol, providing reliable and stable wireless communication.

The HC-05 can be configured using AT commands, enabling users to change parameters such as device name, baud rate, and operating mode. It is commonly used in robotics, home automation, wireless control systems, and IoT applications.

With its compact design and strong compatibility, the HC-05 is suitable for both beginners and advanced users.