Definition - What does Design Pattern mean?
A design pattern is a repeatable solution to a software engineering problem. Unlike most program-specific solutions, design patterns are used in many programs. Design patterns are not considered finished product; rather, they are templates that can be applied to multiple situations and can be improved over time, making a very robust software engineering tool. Because development speed is increased when using a proven prototype, developers using design pattern templates can improve coding efficiency and final product readability.
Techopedia explains Design Pattern
Successful designs and architectures within design patterns make software development easier. Establishing proven design pattern techniques makes them readily available for future system developers. In system documentation, design patterns are also by improving existing system maintenance to create a better help tool. By providing explicit specifications of class and object interaction and the interaction’s original intent, design patterns help developers correctly work through the application.