A pseudonym is a fictitious name or alias used by an individual to conceal their real identity. In cybersecurity and online contexts, pseudonyms help protect users’ privacy, allowing them to interact, publish, or communicate without revealing personal information. This practice is common on social media, forums, and in various online services, where anonymity can reduce risks such as identity theft, harassment, or unwanted surveillance. While pseudonyms can safeguard privacy, they may also be misused for malicious activities, so their use is often balanced with verification measures.