A tonneau cover is a protective covering designed for the bed of a pickup truck. While not directly a cybersecurity term, in digital security discussions it may be referenced metaphorically to describe any mechanism or tool that conceals, secures, or protects sensitive data or system components from unauthorized access, much like how a physical tonneau cover hides and safeguards cargo. In physical security, using a tonneau cover can deter theft by keeping valuable items out of sight, paralleling cybersecurity strategies that focus on obscuring or encrypting critical information to prevent data breaches.