As you know, this website is dedicated to various Unicode symbols. However, right now you are in the emoji section looking at symbols. That's a peculiar maze.
Why were the well-known icons transformed into pictograms? Apparently, to make them look more beautiful on screen. Look, all the letters here are placed inside colourful squares with round angles, framed and improved with gradient. Arrows with shadows, checks with glitters, hieroglyphs with spirals and other unusual symbols.
If you decide to copy these emojis to a post or an article or whatever you want to decorate, they will look much brighter and more appealing than the ordinary black-and-white pics.