Unpatched software refers to computer programs or applications that have not received the latest security updates or fixes from their developers. These updates, known as patches, are released to address vulnerabilities and bugs that could be exploited by cybercriminals. Running unpatched software increases the risk of malware infections, data breaches, and other cyberattacks, as attackers often target known weaknesses. Keeping software up to date is a crucial step in maintaining cybersecurity and protecting sensitive information.