What is a firewall?

Firewall is a security software which helps you to restrict unauthorized access from the outside world and filters out all packets passing through it and allow them to enter or exit. Firewall can restrict all ports on your network or on your system to prevent the unauthorized access that are attempted by a hacker or intruder. Firewall also restrict the inbound and outbound calls means you can restrict user to use Internet by applying some policies on the outbound calls, similarly you can restrict an anonymous user not to access your network from the rest of the world by just applying some policies on inbounds calls. Firewall protect your network a lot so that your network or intranet remain safe from the outside world. My recommendations to you that always keep ON your firewall it will also safe you from trojan horse malware attacks.
There are two types of firewall e.g,
1. Software level firewall
2. Hardware level firewall

Software level firewall

Software level firewall is the firewall which works on your system locally when you're not connected with any network. Software level firewall doesn't provide maximum security.

Hardware level firewall

Hardware level firewall is a firewall which works on hardware level means you use a computer or a router to pass out every inbound and outbound calls to secure your entire network.

So we have learned now, What is a firewall and how it protect you from unauthorized access or from outside world , so keep learning from computerflicks. Please leave comments.