SAFE
A Simple Agreement for Future Equity, a one-page convertible security document developed by YC, designed to be simple, readily available online, and not a debt instrument.
Videos Mentioning SAFE

Andy Bromberg - Startup Investor School Day 4
Y Combinator
Simple Agreement for Future Equity, created by YC in 2014, a popular convertible structure for early-stage fundraising that does not accrue interest.

Carolynn Levy and Kirsty Nathoo - Startup Investor School Day 1
Y Combinator
Simple Agreement for Future Equity, a convertible security used for early-stage startup investments, allowing investors to give money now for stock later without setting terms immediately.

Carolynn Levy - Modern Startup Funding
Y Combinator
A Simple Agreement for Future Equity, a one-page convertible security document developed by YC, designed to be simple, readily available online, and not a debt instrument.

Jessica Livingston Speaks at Female Founders Conference 2015
Y Combinator
A type of investment document created and open-sourced by YC to make funding easier for startups.