Alexa is a virtual assistant developed by Amazon. It is designed to be used with Amazon Echo and other Amazon devices. It can also be integrated with other devices and apps, such as smartphones and smart home devices. Alexa can be activated by saying “Alexa” followed by a command or question. It can be used to play music, set alarms, control smart home devices, get weather and news updates, and more, all through voice commands. Additionally, Alexa has the ability to integrate with a wide range of third-party services, such as ride-hailing apps and news services, to provide additional functionality.