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2. Firewall: A firewall is a piece of hardware, software, or a combination of both that prevents unwanted access to
a network. It keeps track of incoming and outgoing network traffic and makes decisions about which traffic to
allow or deny in accordance with a set of security rules. Figure 9.7 depicts a wall between computer and the virus.
Figure 9.7: Firewall
3. Before using a site, check its security: Browse only those websites that use HTTPS ( HyperText Transfer Protocol
Secure). Figure 9.8 shows the Google welcome page having https status signifying the secure communication
between the user's browser and the web server. When you visit a website that employs HTTPS, the server
utilises a certificate to demonstrate the website's legitimacy to browsers. A web browser may warn you if a
website does not use HTTPS certification.
Figure 9.8: Google welcome page with https status.
4. Use antivirus software: Today's antivirus software provides protection against viruses, malware, and spyware.
But you must keep your antivirus software up to date to safeguard your computer against hazardous viruses and
other threats. Figure 9.9 shows the windows security essentials scanning the systems for viruses and threats.
Figure 9.9 Windows security essentials scanning the systems for viruses and threats.
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