In software engineering, a design pattern is a general reusable solution to a commonly occurring problem in software design that occurs within a context. A design pattern is not 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 reside in the domain of modules and interconnections.
Design Patterns is an object-oriented development methodology providing a proven structure and characteristics for building highly maintainable and extendible software. This methodology presents patterns for managing object creation, composing objects into larger structures, and coordinating control flow between objects, thus offering timeless and elegant solutions to common problems in software design. Design Patterns can improve the structure of software, facilitate maintenance, and help avoid architectural drift.
The purpose of Design Patterns is to capture software solutions that have been discovered, developed and evolved over time, and make them reusable. The reusability and flexibility of code allows finding consistent, well-engineered object-oriented designs appropriate for the needs of the particular application instead of having to repeat the problem and solution again and again. Successful reuse of well-designed and well-tested software components improves software productivity, quality and reliability.
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