Visitor pattern is  a behavioral pattern that allows addition of new features to a class without actually modifying the class. Visitor pattern is one way of implementing the Open/ Close principle (which is one of the SOLID principles).
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Softwares are susceptible to change. A new requirement can come-up any time and the software should be able to handle this change effectively with minimum intrusion. A software that is well designed can easily adapt to these ever-changing requirements and hence a good design is of utmost importance especially when it comes to design and development of a commercial software.
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