MIT license
The simplest open-source license—do whatever you want with the code, just keep the copyright notice.
Think of it like
Public domain but with a tiny string attached: you have to mention who wrote it.
Example
Django, React, Rails. You can use them, modify them, sell products on top, all you need is a copy of the MIT license and original author name.
How it actually works
MIT is shorter than Apache 2.0 and doesn't have explicit patent language, but it's so permissive that patents are largely irrelevant (you're getting the code, not the idea). Very popular for open-source; sometimes too lenient if you want reciprocal openness.
For product teams
Frictionless adoption; maximum permissiveness.
For engineers
Shortest license text; no patent grant but no restrictions.
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