A "Hamburger Menu" is a graphical user interface element that consists of three horizontal lines stacked on top of each other, resembling a hamburger. It is commonly used in mobile and web applications to save space and organize navigation options. When clicked or tapped, it reveals a list of menu items or links, allowing users to access different sections of the application or website. This design pattern is popular because it provides a clean and minimalist look, making it easier for users to focus on the main content. However, some critics argue that it can hide important navigation options, potentially making it less user-friendly for certain audiences.