A pattern is a design in which lines, shapes, forms or colours are repeated. The part that is repeated is called a motif. Patterns can be regular or irregular.
Part of Art and DesignElements of art
Patterns can be regular or irregular.
In regular patterns the motif (or motifs) is repeated in a way that is predictable.
It could be exactly the same each time, or it could change in a way that is regularly repeated.
There are many ways to arrange motifs to create a regular pattern.