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A "stack" in computing is a layered hierarchy of protocols. The Bluetooth Stack is the software and firmware framework that controls the Bluetooth hardware (the radio chip). It acts as a translator between the raw radio waves in the air and the meaningful data displayed to the user (like audio files or text messages).

Understanding the Bluetooth Stack is essential for developers and engineers. If you are building a smart home device, you might focus heavily on the GATT layer to define how your sensor sends temperature data. If you are designing the hardware, your focus is on the PHY and Link Layer to ensure the radio signal is strong and efficient. bluetooth stack

The stack is generally divided into two main sections: the (lower layers) and the Host (upper layers). These two sections communicate with each other through a standardized interface called HCI (Host Controller Interface) . A "stack" in computing is a layered hierarchy of protocols