Computer security breaches are commonplace, and several occur around the world every day. Some are considered minor, with little loss of data or monetary resources, but many of them are considered major, or even catastrophic.You might have heard about the 2014 hacking of Sony Pictures' network, which the FBI attributed to the North Korean government. More recently, Russian hackers have been accused of tampering with voting systems in the 2016 U.S. presidential election and with Ukranian businesses and governmental agencies.

Source: What is Network Security and Why is it Important?