Echo Dot is new innovated product by Amazon which is hands-free, voice controlled device that uses that can recognize voice and perform tasks like play music, set alarms and timers, weather and sports scores, check your calendar, manage to-do, shopping lists, control smart home devices and many other things.
This device uses same far-field voice recognition as 
Further, you can control lights, plugs (obviously from compatible devices). Also, You can order food from Zomato, request a ride from OLA and many more things.