High fidelity (often shortened to Hi-Fi or HiFi) is the high-quality reproduction of sound. It is important to audiophiles and home audio enthusiasts. Ideally, high-fidelity equipment has inaudible noise and distortion, and a flat (neutral, uncolored) frequency response within the human hearing range.
The one main advantage that a hi-fi system has over all the other high quality audio options out there is that you can build it to feature exactly what you want. Not only that, but each unit you include in your system has one specific task to perform and can focus on doing it really well. This will give you a much more superior sounding result.