An application programming interface (API) is a connection between computers or between computer programs. -Wikipedia
Here are some examples of everyday APIs: booking a flight on a travel website, paying for an online product using PayPal, using the Google login to access this platform.
If you could make connections in your life to make things easier (via an interface of some sort), what would those things be? My example would be to automatically schedule a last minute Airbnb vacation on the same weekend that has the best weather...and it would automatically cancel my planned events during that time.
What would your personal API look like?