Cats have become a staple of Internet culture in recent years. From Grumpy Cat to Lil BUB, cats have dominated the digital world in GIFs, memes, videos and more. But what makes these furry felines so interesting? Is it because of their looks, wit or personality, or is it something else altogether? It's hard to pinpoint one particular characteristic, but thanks to the popular site Cats of Instagram—which provides us with daily doeses of cat awesomeness—we don't have to. Here we crown the best cat photos on Instagram.