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> Index of every page on this site: [llms.txt](https://shortformtech.com/llms.txt)

# Explainers

Clear guides to the ideas and techniques behind technology.

[ExplainersExplainers14 Nov 20262 min read<h3>Passkeys explained: why your fingerprint can replace a password</h3>Passkeys let you sign in with Face ID, a fingerprint or a device PIN. Here's how they work, why they're safer and what happens if you lose your phone.](https://shortformtech.com/posts/passkeys-explained)

[ExplainersExplainers14 Nov 20262 min read<h3>The exposure triangle, explained with one photo</h3>Aperture, shutter speed and ISO make more sense when you change one at a time. Here’s what each does and how they work together.](https://shortformtech.com/posts/exposure-triangle)

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