> For the complete documentation index, see [llms.txt](https://docs.factor.fi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.factor.fi/factor-building-blocks/flash-loan/concepts.md).

# Concepts

The Flash Loan Building Block enables strategies to access instantaneous and uncollateralized loans in a trustless manner. This requires leveraging segment specific concepts that have been implemented by multiple DeFi protocols as listed below:

<table data-view="cards"><thead><tr><th></th><th data-hidden></th><th data-hidden></th></tr></thead><tbody><tr><td><a href="/pages/hj8ifraedvkffFl9Jlxs"><strong>Uncollateralized Lending &#x26; Borrowing</strong></a></td><td></td><td></td></tr><tr><td><a href="/pages/OwZFsoX7wXl8O7y336hj"><strong>Flash Loan</strong></a></td><td></td><td></td></tr></tbody></table>