Firewall, A security barrier that blocks unwanted network traffic, Phishing, A scam that tricks you into giving personal information, Encryption, Scrambling data so only the right person can read it, Decryption, Turning scrambled data back into readable data, Authentication, Proving who you are (e.g. login, fingerprint), Password, A secret word used to access an account, Malware, Harmful software designed to damage or disrupt, Virus, A type of malware that spreads by copying itself, Trojan, Malware disguised as something safe, Spyware, Software that secretly monitors what you do, Adware, Software that shows unwanted adverts, Ransomware, Malware that locks files and demands payment, Patch, A fix for a bug or security weakness, Update, A newer version of software with improvements/fixes, Backup, A safe copy of files in case you lose them, Cloud storage, Saving files online instead of just on your device, Browser, Software used to view websites, Search engine, A tool that helps you find information online, URL, The web address of a page, Domain name, The main name of a website (e.g. bbc.co.uk), Server, A powerful computer that provides services/data, Client, A device or computer that requests services/data, Protocol, Rules for how data is sent and received, HTTP, A protocol for loading web pages, HTTPS, A more secure version of HTTP (uses encryption), Cookie, A small file saved by a website to remember you, Cache, Saved data that helps things load faster next time, Bandwidth, How much data can be sent per second, Latency, Delay in data travelling across a network, Packet switching, Sending data in small chunks via different routes, Router, Directs data between networks and the internet, Switch, Connects devices within a local network (LAN).

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