Form refers to objects that are three dimensional in nature. A form has: height, width and depth.
We readily recognise the forms around us – from a pencil to the form of the human body.
Form can be used to define space, create contrast & visually add volume to a composition.
Form is depicted visually using other elements such as line, shape & tone.
Form can be enhanced using tone, the addition of shadows and highlights can help us to ‘read’ the true form of an object.
Forms can vary from geometric &constructed to the organic forms of the nature world. Form can be communicated via a 3D Isometric Drawing ot a loose & flowing charcoal life drawing. (Source)