The Alt key, also known as the alternate key, is a modifier key found on most computer keyboards. This key is often used in combination with other keys to perform various functions, such as accessing menus, shortcuts, or special characters. Other synonyms for the Alt key include the Option key (found on Apple keyboards), the Meta key (found on some Unix-based systems), and the Alternate Graphic key (found on some European keyboards). Additionally, the Alt key can be referred to as the Alt modifier or simply the Alt button. Whatever its name, the Alt key remains a vital component of keyboard navigation and productivity.