HTTP status codes explained: 200, 301, 404, 429, 500 and more
What HTTP status codes mean, from 200 and 301 to 404, 429 and 502, how to see them in your browser, and how to fix the most common…
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<p>The protocols, services and habits behind the web.</p>
Symmetric vs asymmetric encryption: what is the difference?
Symmetric encryption uses one shared key, public-key encryption uses a key pair. How each works, why HTTPS combines them, forward secrecy and post-quantum changes.
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How do digital signatures work? A plain-language guide
A digital signature proves who signed a file and that it has not changed. How signing and verification work, how they differ from encryption and where you rely…
Read the guide →What is a public key? Public vs private keys explained simply
A public key is the shareable half of a key pair: it encrypts and verifies signatures, while the private key decrypts and signs. What it looks like, where…
Read the guide →How HTTPS certificates are checked
The padlock in the address bar is the visible result of a check that happens in a fraction of a second: the browser has confirmed that the server…
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How email delivery works
Email moves through several systems. A sending client submits a message to a mail server, which looks up the recipient domain's mail records and transfers the message to…
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How DNS works when you open a website
Computers find each other by IP address, but people remember names. The Domain Name System is the distributed directory that turns versuss.space into an address a network can…
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VPN explained: what it protects and what it does not
A virtual private network is marketed as a switch that makes you anonymous, secure and invisible. It is none of those things.
Read the guide →HTTP and HTTPS: what changes when a site is secure
Every web page, image, form submission and API call travels over HTTP, the Hypertext Transfer Protocol. HTTPS is the same protocol carried inside an encrypted, authenticated tunnel.
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How search engines discover and rank pages
A search engine answers a query in a fraction of a second, but almost none of that work happens when you type.
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