Firewalls are network secrity devices or software that act as a barrier between trusted (internal networks within an organisation) and untrusted networks (i.e internet). The primary purpose is to control and onitor incoming and outgoing network traffic based on predetermined security rules. Firewalls play a cruciual role in protecting a network from unauthorised access, cyberattacks and potential threats. Firewalls are a fundamental component of network security, and they are used to create security policies that dictate which traffic is allowed and which is blocked. They are an essential part of any comprehensive cybersecurity strategy.