Cyber warfare is combat in cyberspace and includes computers, the Internet and the sphere of human thought (Noosphere, Social Media) Cyber warfare can be conducted by traditional nation-states and other actors. The boundaries between conventional operations (munitions, psychological) and cyber-operations is blurring, as cyber attacks begin to be used as a force multiplier in conventional operations. Countries such as the USA, China, Israel and Russia, were the first to invest significantly in building cyber warfare capabilities.”]
Source: https://securityaffairs.co/wordpress/6776/security/the-cyber-war-era-began-long-ago.html