A blockchain is a digital record-keeping system that stores information in connected blocks that are linked together in a chain, making it very difficult to change past information without everyone noticing. It's used to track transactions, especially in cryptocurrencies like Bitcoin.

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Two-factor authentication is a security method that requires two different ways to prove your identity before you can access an account. It combines something you know (like a password) with something you have (like your phone) or something you are (like your fingerprint).

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A VPN (Virtual Private Network) encrypts your internet connection and hides your IP address by routing your traffic through a secure server, making your online activity private and harder to track. It protects your data from being seen by your internet provider, hackers on public WiFi, and websites you visit.

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Wi-Fi uses a wireless internet connection from a nearby router in your home or business, while cellular data uses radio towers operated by mobile carriers like Verizon or AT&T. Both let you access the internet on your phone or device, but they work differently and have different speeds and coverage areas.

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A phishing attack is a scam where criminals send fake emails, texts, or messages pretending to be from trusted companies to trick you into giving them your passwords or personal information. You can spot one by looking for suspicious links, urgent language, and emails from addresses that don't match the real company.

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