What is Firewall?
A firewall is a security system that monitors and controls network traffic to protect a device or network from unwanted access. It acts like a gatekeeper, allowing safe traffic in and blocking suspicious traffic out.
In more detail
A firewall is a security tool that checks the data moving between your device or network and the internet. It decides which connections are allowed and which should be blocked based on set rules.
Firewalls matter because they help stop hackers, malware, and unauthorized apps from reaching your system. They also reduce the risk of sensitive information being exposed when you browse, email, or use online services.
In everyday computer use, a firewall often runs in the background on your laptop, phone, router, or company network. You may not notice it, but it helps keep your connections safer while you work, stream, shop, or sign in to accounts.
Examples
- Blocking a suspicious app from sending data to the internet
- Allowing your web browser to connect to a website while denying unknown incoming connections
- Protecting a home Wi-Fi network with a router firewall
- Stopping unauthorized remote access to a work computer
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