Design patterns are reusable SOLUTIONS for common software development challenges. REPETITIVE code, redundant functions, and logic are examples of these issues. These aid in the development of software by reducing the amount of effort and time required by the developers. Design patterns are widely used in object-oriented software products to incorporate best PRACTICES and promote reusability in the development of reliable code.

Design patterns are DIVIDED into three categories. They are as follows:

• Creational Patterns: By hiding the logic, these patterns provide you with more options when it comes to generating objects. The objects created are independent of the implemented system. Factory design pattern, Builder design, Prototype design, Singleton design, and Abstract Factory design are some examples of creational patterns.
• Structural Patterns: These patterns aid in the definition of class and object structures, as well as the construction of classes, interfaces, and objects. Adaptor design, Facade design, Decorator design, proxy design, and other structural patterns are examples.
• Behavioural Patterns: These patterns assist specify how objects should communicate and interact with one another. Command pattern, Iterator pattern, Observer pattern, Strategy pattern, and so on are examples of behavioural patterns.