Element of design pattern

A pattern has 4 essential elements:

In software engineering, a design pattern is a general repeatable solution to a commonly occurring problem in software design . A design pattern isn’t a finished design that can be transformed directly into code. It is a description or template for how to solve a problem that can be used in many different situations.

Design patterns are a means to communicate, identify, and remember solutions to common problems. Each pattern names, explains, and evaluates a solution to a common problem. Each design pattern has four essential elements: Behavioral, Creational and Structural Diagram .