<ul><li>Design patterns are reusable solutions to common problems in software design, used to improve maintainability, testability, and scalability.</li><li>Singleton Pattern provides a single shared object across the app, like a logging service or configuration reader.</li><li>Factory Pattern helps abstract object creation when the type is decided at runtime, like deciding which shape or parser to use.</li><li>Dependency Injection keeps components loosely coupled and makes testing or swapping implementations easy.</li></ul>

Understanding Design Patterns in .NET: A Simple Guide to Ace Interviews

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