To amplify means to make something louder, stronger, or more powerful. When a musician plugs an electric guitar into an amplifier, the device amplifies the guitar's sound so a whole auditorium can hear it. Without amplification, an electric guitar sounds quiet and thin.

Scientists and engineers amplify all sorts of things beyond sound. A microscope amplifies tiny details so you can see cells and bacteria. A telescope amplifies distant light so you can observe faraway stars. When doctors need to detect a specific virus in a blood sample, they use special techniques to amplify traces of it until there's enough to identify.

The word also describes making ideas or messages reach more people. When you share a friend's great idea with the whole class, you're amplifying their voice. Social media can amplify news stories, spreading them to millions of readers in hours. Sometimes people amplify problems by talking about them constantly, making small issues feel bigger than they really are.

An amplifier (often shortened to amp) is any device that increases power or volume. The core idea behind amplify is always the same: taking something that exists and making it bigger, louder, stronger, or more noticeable.