The Bluetooth feature built into most A/V receivers (or Bluetooth adapters) is to allow a portable device such as a phone or tablet to stream music to that receiver. This way you can listen to your digital music or streaming apps like Pandora or Spotify from your phone through your main speaker system.
An embedded system is a computer system with a dedicated function within a larger mechanical or electrical system, often with real-time computing constraints.[1][2] It is embedded as part of a complete device often including hardware and mechanical parts.
Examples of embedded devices include dishwashers, banking ATM machines, routers, point of sale terminals (POS terminals) and cell phones. Devices that can connect to the Internet are called smart or intelligent. If an embedded device can not connect to the Internet, it is called dumb. Embedded devices in complex manufactured products, such as automobiles, are often headless. This simply means that the device's software does not have a user interface (UI). In such cases, an in-circuit emulator (ICE) is temporarily installed between the embedded device and an external computer to debug or update the software.