notepad

noun
  1. A small book or binder of blank, often lined, pages for writing notes. noun
    She jotted down the phone number on her notepad.
    He always carries a notepad to meetings to take notes.
  2. A software application used for writing and editing text on a computer. noun
    I use a notepad application to draft my essays before finalizing them.
    The programmer opened the notepad to write some quick code snippets.