✅ A checkbox is a graphical user interface element that allows users to select or deselect an option by clicking on it. It typically appears as a small square box that can be filled with a checkmark or another symbol to indicate its selected state. Checkboxes are commonly used in forms, surveys, and settings menus to provide users with multiple choices and allow them to make selections easily. They are often accompanied by descriptive text to clarify the purpose of the option.