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sidebar_position: 1
title: Introduction
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Squiggle is an _estimation language_, and a syntax for _calculating and expressing beliefs_ involving uncertainty. It has use cases in forecasting and writing evaluations.

## Get started

- [Gallery](https://www.squiggle-language.com/docs/Discussions/Gallery)
- [Squiggle playground](https://squiggle-language.com/playground)
- [Language basics](https://www.squiggle-language.com/docs/Features/Language)
- [Squiggle functions source of truth](https://www.squiggle-language.com/docs/Features/Functions)
- [Known bugs](https://www.squiggle-language.com/docs/Discussions/Bugs)
- [Original lesswrong sequence](https://www.lesswrong.com/s/rDe8QE5NvXcZYzgZ3)
- [Author your squiggle models as Observable notebooks](https://observablehq.com/@hazelfire/squiggle)