It originated from the button design used on websites and apps to announce 'new features' or 'what's new.' It's much more eye-catching than plain text and has the effect of encouraging clicks.

It's used broadly, from new product notifications on online shopping malls to personal life updates on social media. It goes beyond simply conveying 'newness' and also serves to communicate anticipation or excitement about change. Try posting it with your new hairstyle!