So what

related: First, Make Me Care

This is a question that is quite effective at cutting fluff, extracting out the important bits, suitable for many occasions.
e.g. in presentations, in tracking Work Accomplishments, in software development, in client interactions, etc.

Software development
This is a question you should be asking yourself when you talk about your impact.

I made a nice UI. So what? Anyone can make a UI. What does your UI help make possible?
I made a data processing engine. So what?
You catch the drift.

Reference:

• First, Make Me Care, by Gwern · Gwern.net: why reader have to care?