What is gof?

I see this question a lot in my coding class. Gof is short for "Gang of Four." It's about four guys who wrote a very famous book. The book is for computer programmers. It is called "Design Patterns." This book shows good ways to solve common problems when you write code. So, when people talk about a "GoF pattern," they mean an idea from this important book. It helps people make better software. It is a very useful book for people who code.