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This is an extension of an answer that I wrote on Quora years back. The question is: How are software design patterns implemented in real life? Design Patterns are actually used extensively in real-life software projects, and their main purpose is creating extensible, reusable, and maintainable software. Of course, you can write software without using any of the design patterns, it will work, but you will end up in a massive pile of source code that looks like a dense forest to a new developer. ...