Definitions:
mark (letters, words, or other symbols) on a surface, typically paper, with a pen, pencil, or similar implement

compose, write, and send (a letter) to someone

compose (a text or work) for written or printed reproduction or publication; put into literary form and set down in writing

enter (data) into an electronic or magnetic storage device, or into a particular location in a computer’s file system

underwrite (an insurance policy).