Haha, it's just a tagline, the general idea is that KFC has appeared in the world, people's daily life has become one more food, which adds a little flavor to life. "Taste" refers to the deliciousness of KFC, but also alludes to the fact that it adds a lot of fun to people's daily life. I guess the creator of this phrase didn't think too y about it. I guess the creator of that phrase didn't think too hard.