An echocardiogram, or echo, is a test that helps doctors check on your heart health. The test, which is a kind of ultrasound, uses harmless sound waves to create a real-time moving picture of your ...

Skype has a built-in feature that’s mainly designed for audio testing. And it’s called the Echo/Sound Test Service, also known as echo123. If you’re wondering how to activate and use this tool on your ...