Amazon Echo and Alexa are Related to Each Other But Both are Other Things. Amazon Alexa is a Device and an Echo Dot is a Name of Alexa Speaker. Amazon Alexa is a Very Useful Device For Humans Because of this Device They Can Easily Play Songs, Set Alarm, Etc With Voice Command. I am also the User of Alexa So I Feel Free If Alexa is Near Me. If You Have any Issue With Amazon Alexa Like If You Want to Setup Amazon Alexa App then Visit the Official Website.