The interface is essentially the way we interact with technology. It's like the "face" of any device or application that helps us understand how to use it. For example, on a computer, it can be icons and menus that allow us to open our favorite applications. On a smartphone, it's the screen that we swipe to write messages or watch videos.
The interface can be compared to the front door of a house. To get inside and take advantage of everything, we need a clear and convenient handle on the door. If the interface is as easy to use as a light door handle, then it's pleasant and simple for us to use the device without thinking about complex technical details.
From computers to smartphones, the interface impacts our lives by making technology more accessible. If you've ever asked yourself why it's so easy to scroll through your social media news feed or use navigation on your phone, it's thanks to the interface that has been designed to be intuitive. And it's precisely because of a good interface that we can spend more time on important things instead of puzzling over how something works.