Ransomware defense involves safeguarding computer systems and data from malicious software that encrypts files and demands a ransom for decryption. To protect against this threat, individuals and organizations should employ proactive measures. These include regular data backups, software updates, and robust cybersecurity software. User education on recognizing phishing emails and suspicious websites is vital. Network segmentation can limit the spread of ransomware within an organization. Additionally, developing an incident response plan is essential to minimize damage if an attack occurs. By combining these strategies, one can significantly reduce the risk of falling victim to ransomware and its potentially devastating consequences.