A pattern for software architecture describes a particular recurring design problem that arises in specific design contexts, and presents a well-proven generic scheme for its solution. The solution scheme is specified by describing its constituent components, their responsibilities and relationships, and the ways in which they collaborate.
Patterns are supposed to help you build on the collective experience of skilled software engineers. They capture existing, well-proven experience in software development and help to promote good design practice. Every pattern deals with a specific, recurring problem in the design or implementation of a software system. Patterns can be said to exhibit the following properties:
A pattern addresses a recurring design problem that arises in specific design situations and presents a solution to it.
