The historical definition of  network security  is to use a firewall to screen users coming into the network, but as  IT technology  and  security technology  have evolved, the definition is much broader now. Today,  network security  is everything a company does to ensure the security of its networks  and everything connected to them . This includes the network, the cloud (or clouds), endpoints, servers, users and applications.  Cybersecurity  products seek use preventive physical and software measures to protect the network and its assets from unauthorized access, modification, destruction and misuse. These products typically target certain assets on the network: Firewalls  prevent unauthorized users from accessing the network by allowing or denying traffic. Anti-Virus/Malware software  protects network endpoints and servers from becoming infected by damaging software that can corrupt files, export sensitive data,...