KISS
In plain terms
A principle: Keep It Simple, Stupid.
Going deeper
KISS advises favoring simple, straightforward solutions over complex ones, since simplicity improves reliability and maintainability. Simpler is usually better.
Under the hood
Counters over-engineering; the simplest design that works is often the best.
Examples
Avoiding over-engineering, simple designs, readable code, pragmatism.
Think of it like...
Like choosing a plain, reliable tool over an elaborate gadget for a simple job.