Amazon Echo is a smart speaker developed by Amazon. There are three versions of Amazon Echo, namely: entry-level Dot, standard version of Echo, and portable version of Tap. The appearance of the Echo is no different from a normal Bluetooth speaker, and there is no screen. The only way to interact is voice. Alexa is the voice assistant for Amazon speakers and is similar to Siri in iPhone. Alexa is equivalent to Echo's brain, and all input and output information is processed through it. With simple voice commands, you can accomplish many daily chores.