If you've ever used a Wi-Fi router to connect to the internet, you've probably wondered what all the blinking lights mean.

If your Alexa is blinking yellow, it means you have an unread message. If your Alexa is flashing green, it means you have an incoming call. Other colors (like blue, purple, orange, and red) indicate ...

Blinking lights near an ethernet port on an ethernet switch - Kynny/Getty Images Have you ever looked at the back of your computer and noticed the lights where the cables are plugged into your PC?