What am I?

I can swim but never get wet. I can run but never get tired. I follow you everywhere but never say a word. What am I?

related riddles

If you have three, you have three. If you have two, you have two. But if you have one, you have none. What am I?

What language do people speak without saying a word out loud

You saw me where I could not be. Yet, often you see me. What am I?