Amazon Alexa is a voice assistant developed by Amazon that operates on various Amazon devices like the Echo Dot. The document then lists the most common problems with Alexa devices such as Alexa not responding, music playing on the wrong device, streaming issues, Wi-Fi connection issues, issues with Alexa calling, and Bluetooth connection issues. It provides troubleshooting steps for each problem such as restarting devices, checking passwords and connections, reducing Wi-Fi congestion, and repairing or re-pairing Bluetooth devices.