Cybercrime has existed since 1820, beginning with the earliest forms of computers like the abacus. Common cybercrimes include hacking, child pornography, DOS attacks, virus dissemination, computer vandalism, cyberterrorism, software piracy, phishing, and credit card fraud. Cyber security aims to prevent, detect, and respond to online attacks by protecting sensitive personal and business information, defending against critical attacks, and allowing safe internet browsing and data processing through regular software updates. Improved hacker abilities, interconnected computers, advanced malware, and increased cyber warfare threaten online security going forward.