An interposer is a small hardware device or circuit board inserted between two components, such as a server’s processor and its memory. Its main function is to intercept, relay, or modify data signals passing between these components. Interposers are commonly used to enhance compatibility, enable new features, improve performance, or add security measures without redesigning the main hardware. In cybersecurity, interposers can help monitor or control data flow, detect anomalies, or prevent unauthorized access, making them valuable tools for both protection and system upgrades.