I have many windows but no house. You can play, write, and surf on me. What am I?

I have a sharp back but cannot scratch myself. I can cut almost anything, but I am always whole myself. Solve the riddle → I have no body, but I can whisper and howl. I cannot be seen, but I make the trees sway. Who am I? Solve the riddle → I eat up mistakes without having a mouth, and get smaller each time. What am I? Solve the riddle → I come in sheets with lots of tiny air bubbles. I am used to protect things when they are transported. It's fun to pop me! What am I? Solve the riddle → I play music and make the sound louder. I often stand on a table or a shelf. What am I? Solve the riddle →