A Port Blocker is a vital computer security component that blocks and prevents open computer ports from being used to compromise laptop, desktop, servers and other computer equipment.
BadUSB enabled memory sticks can be plugged into a computer's USB port for a few seconds to launch payloads like capturing confidential data, inserting malware, or otherwise preventing normal operation, even when the computer is not connected to a network. Port Blockers can prevent these consequences and juice jacking attacks. They can also provide tamper-evidence that this has been attempted.
These are intended to block ports indefinitely and offer tamper-evidence should their removal have been attempted.
These prevent denial-of-service either intentionally or accidentally (e.g. when moving servers).
All these types of port blockers are computer hardware protection mechanisms.