# What is Edge Case?

A scenario that happens at the extreme limits of normal use. Edge cases break products that were only tested against the happy path.

## In real work

Write edge cases for the file upload feature. What happens with a 0-byte file, a 10GB file, a duplicate name, and no internet?

## Related terms

- [User Story](https://prompthausapp.com/learn/user-story.md)
- [Acceptance Criteria](https://prompthausapp.com/learn/acceptance-criteria.md)
- [MVP](https://prompthausapp.com/learn/mvp.md)
- [Jobs To Be Done](https://prompthausapp.com/learn/jobs-to-be-done.md)
- [Product-Market Fit](https://prompthausapp.com/learn/product-market-fit.md)

## How is this different from Googling it?

Google gives a definition. Prompthaus pairs each term with how it shows up in standups, PRs, prompts, and design reviews—then quizzes you until the word sticks. One term a day on iPhone.

- Category: Product
- HTML: https://prompthausapp.com/learn/edge-case
- App Store: https://apps.apple.com/us/app/prompthaus-ai-vocabulary/id6776314407