Explainers
Practical explanations of the systems behind everyday technology and money.
HTTP 304 Not Modified: How Cache Validation Works
How browsers validate cached responses with ETags, why 304 has no body, and when a server sends 200 instead.
Interchange Fee Caps: EU, US, Canada and Australia
How interchange fee limits differ across the EU, US, Canada and Australia—and why the cap is not the total merchant fee.
Anycast Explained: How One IP Address Reaches Many Places
How one IP address can route requests to servers in different locations.
AI Temperature Explained: Why Answers Vary
How temperature changes token sampling, how top-p differs, and why consistent wording does not prove a fact.
HTTP 206 Partial Content: How Downloads Resume
How byte ranges support resumed downloads, why 206 is successful, and what 200 or 416 means.
Network Tokenization Explained: Why a Saved Card Keeps Working
How network tokens replace a stored card number, survive a card reissue and what a merchant still has to check.
HTTP 429 Explained: Too Many Requests and Retry-After
A 429 response asks a client to slow down; Retry-After can say when to try again.
Lock File Explained: What Dependency Installs Preserve
How npm lock files record dependency versions, why npm ci rejects mismatches, and what a lock file cannot guarantee.
SBOM Explained: What a Software Bill of Materials Lists
What an SBOM records, how teams use it in vulnerability response, and why an inventory is not a security verdict.
Embeddings Explained: Meaning as Coordinates
How text becomes a vector, how semantic search ranks neighbors, and why similarity still needs evaluation.
Convertible Note vs SAFE: Interest, Maturity and Conversion
A note is a loan that can become shares; a SAFE promises shares later. What interest and a maturity date change.
The Mempool Explained: Where a Crypto Transaction Waits
Why a sent transaction can sit unconfirmed, who decides the order, and how fee bumps and expiry rules work.
SSL Certificate Expired: What Breaks and How to Prevent It
Why an expired SSL/TLS certificate breaks a site, how revocation differs and why renewal now has to be automated.
Authorization Hold Explained: Pending Card Charges
Why a card authorization hold reduces available funds, how it becomes a final charge and what reversals do.
Content Credentials Explained: What a C2PA Label Proves
What a signed C2PA record on an image or video contains, what valid and trusted mean, and what it cannot prove.
PCI SAQ Types: Which Self-Assessment a Merchant Fills In
Which PCI self-assessment questionnaire fits each way of taking cards, and how checkout design sets SAQ A or A-EP.
Device Code Flow Explained: Why a TV Shows a URL and Code
Why TVs show a URL and short code, how OAuth approval works and which phishing check matters.
Staged Rollout Explained: Why an App Update Reaches You Days Later
A release announcement and your device's update are different events. Staged rollouts explain the gap.
Tender Offers for Employees: Shares, Limits and Cash
Check eligible shares, sale limits and deductions before treating an employee offer as cash.
Crypto Gas Fees Explained: Work, Price and the Final Bill
Read Ethereum fees by separating gas used, price per gas and the final execution charge.
Blockchain Bridge Explained: Assets, Proofs and Risk
Follow a cross-chain transfer from its source transaction to the asset received on the destination chain.
Down Round Explained: Price, Dilution and Options
See how a lower share price changes ownership, investor rights and employee options.
Chrome Origin Trials: How to Test Browser Features Safely
How trial tokens enable experimental browser features, and how to keep a usable fallback.
Prompt Injection Explained: When an AI Tool Obeys a Stranger
How text in an email, page or file can redirect an AI tool, and which controls limit the damage.
Start with a question you recognize: what happens after tapping a card, which permissions an AI assistant needs or whether your notes will survive a move to another app. These guides connect the visible interface to the mechanisms behind it, using clear examples and links to original documentation.
The library spans AI, Payments & Fintech, Crypto & Web3, Apps & Software, Tech & Internet and Startups & Ventures. Each desk also has current reports for readers who want to follow new developments.
Begin with 10 People Shaping Fintech for an introduction to influential contributors, or visit the news desk for recent releases. Our guides describe researched information without implying hands-on tests that have not taken place.