Operational security (OPSEC) refers to the processes and measures taken to protect sensitive information from being accessed by unauthorized individuals. In the context of an internet cafe with public computers, the lack of operational security is evident, as anyone can use these computers, making it easy for malicious actors to intercept data. Public networks are particularly vulnerable to hacking, which contrasts with the more secure internal networks typically provided by companies that implement specific security protocols to safeguard communications. Understanding OPSEC is crucial for maintaining privacy and protecting sensitive information in shared or public environments.