Completeness refers to the state of being whole or having all necessary parts. In various fields, such as mathematics and computer science, it indicates that a system or set of information includes everything required to function correctly or to make accurate conclusions. For example, in mathematical logic, a complete system can derive every truth within its framework. In everyday contexts, completeness can apply to tasks or projects, meaning that all components have been addressed. For instance, a checklist is often used to ensure completeness by confirming that each item has been completed before considering the task finished.