Fallback refers to a backup plan or alternative option that is activated when the primary choice fails or is unavailable. It ensures that there is a safety net in place, allowing for continuity and minimizing disruption. For example, in technology, a system may have a fallback mechanism to switch to a secondary server if the main server goes down. In everyday life, fallback can apply to various situations, such as having a Plan B for a trip if the weather turns bad. It provides reassurance and flexibility, allowing individuals or systems to adapt to unexpected changes or challenges effectively.