Full video: https://youtu.be/bJkOs8T3Acg
Complete tutorial for building your own Alexa: https://circuitdigest.com/microcontroller-projects/how-to-build-an-amazon-alexa-speaker-using-raspberry-pi-4

Alexa is the language assistant launched by Amazon in 2014 and used, for example, in smart speakers like the Amazon Echo or the Echo Mark. Alexa serves as a central control unit in these devices that respond to the user's voice commands. For example, you can download songs from Amazon Music or Spotify, play audiobooks from Audible, and get news and weather updates. Even the program can manage regular activities such as shopping and to-do lists can be determined and appointments can be scheduled in the appropriate calendar.

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