Cybersecurity is the practice of protecting electronic devices, networks, and sensitive information from unauthorized access, use, theft, or destruction. The document discusses types of cyber attacks like phishing, malware, and ransomware and their devastating effects on businesses and individuals. It provides best practices for cybersecurity which include using strong passwords, updating software regularly, enabling two-factor authentication, and protecting company data with firewalls and anti-virus software to stay safe against phishing attacks.