Line is a mark made using a drawing tool or brush. There are many types of lines: thick, thin, horizontal, vertical, zigzag, diagonal, curly, curved, spiral, etc. and are often very expressive. Lines are basic tools for artists though some artists show their lines more than others.
In terms of art, line can be described as a moving dot. Line is perhaps the most basic element of drawing. Line Variation - the use of a variety of line including width, length, texture, thickness, etc. to add interest to a drawing or painting. Length - lines can be long or short.