Texas School for the Blind and Visually Impaired Outreach Communication has three parts. Form is how the communication happens. It is the behavior used to communicate. Speech is one communication form.
Sign language is another.
Crying, using objects, using pictures, even falling asleep - all of these are behaviors we do, forms we use, to communicate. All of these are reasons why we communicate. Content is the part of communication that deals with meaning. It is noon. I am hungry.