Do you know about design patterns? Which design patterns have you used, and in what situations?

Question

In software engineering, a design pattern is a general repeatable solution to a commonly occurring problem in software design. A design pattern isn't a finished design that can be transformed directly into code. It is a description or template for how to solve a problem that can be used in many different situations.

Answer 1

singleton pattern, builder pattern, multiton pattern, visitor pattern, decorator pattern, iterator pattern, mvc pattern, adapter pattern are the ones that pop into my head right now. I used them well where they were needed or were they should be used.