What is it?

Question: I come in many different colors. I create boundaries to keep things concealed and safe. My best friend is a lock and I am also made of different materials as well. I love to travel: you can find me anywhere. What am I?

Question: My thickness is no more than a few centimeters, yet my depth can span to infinity. Although mundane, I intimidate most animals. When in my presence, you will inevitably follow me. What am I?

Question: What has a face and two hands?

Question: Some people peel my skin some people don't, you eat me nevertheless, with or without, what am I?

Question: What tastes better than it smells?

Question: What goes in the water black and comes out red?