The light ring on your Amazon Echo speaker is used to communicate different things to you, letting you know an action has been performed or an action is needed at a glance. The amount of different light ring communications has been reduced recently, simplifying things for users.
You will see a blue light after you interact with your echo speaker and Alexa, and means that Alexa is processing your current request. If the blue light is only in one section of the light ring, it means Alexa is listening.
This only appears when you have turned the microphone or camera off on your Echo device using the button on the top. Your Echo device is essentially disabled when the light is red.
If you see the orange light, your Echo device is telling you that it is experiencing connectivity issues, either to the Wi-Fi or to the Amazon Alexa app. Try unplugging the Echo and then plugging it back in, or check the Alexa app on your phone/tablet for information.
Your Echo is telling you that there is a message or a notification (from Amazon.com for example) waiting for you. Simply say “Alexa, what are my messages/notifications”.
This means that your Echo device is on an active call. It can also mean that you are in an active Drop In if you have this feature set up. You can say “Alexa, end the call/end the drop in”.
A purple light means that the Do Not Disturb mode is active. While in this state, your Echo and Alexa will not interact with you.