The gathering of publicly accessible information, searching social media, focused online searches.
Recon is the first step of the Cyber Kill Chain. In this phase attackers will identify their targets, research and plan, and gather information about their potential targets. Organizations reveal a lot of information about themselves freely on their websites, and savvy attackers will use this information to determine potential targets and goals.
Sun Tzu once said “If you know the enemy and know yourself, you need not fear the result of a hundred battles.”