What is a Firewall and How Does it Work?

What is a Firewall and How Does it Work?
Firewalls have essentially been around since the beginning of the internet. A firewall is a network device designed to protect your system by monitoring and controlling information traffic based on a preset list of rules to ensure security. Firewalls establish a barrier of protection between a trusted network and a foreign network. They are one of many defense methods to protect your data and system.

Origins
The original term ‘Firewall’ dates back to 1851. The term was meant to be taken at face value. After all, it refers to a literal wall meant to keep fires from spreading. In 1988, the Morris worm, one of the earliest worms distributed throughout the internet, sparked a newfound interest in cybersecurity. As a result, the Morris worm marked the first time people really felt they needed to protect themselves. Following the attack, the earliest forms of Firewall started appearing.
TYPES OF FIREWALL
Packet Filters
Stateful Filters
Application Layer

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