Yes, you know, an anti-virus program look at the contents of each file, searching for specific patterns that match a profile - called a virus signature - of something known to be harmful.
The firewall can check whether a given packet should pass, allowing the computer’s user to respond to unanticipated network traffic. The firewall can filter packets based not only on their point of origin or destination, but also on their content.
However, you can buy a program like the NOD32 with all these functions integrated, or you can try to obtain some security software like anti-virus, firewall, and file encryption programs, each one in separate complicated packages.
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