KISS, as an acronym, is most commonly associated with the principle "Keep It Simple, Stupid". This design principle asserts that systems work best if they are kept simple rather than made complex. Simplification should be a key goal in design and unnecessary complexity should be avoided.

The KISS principle was first coined by Kelly Johnson, a lead engineer at Lockheed Skunk Works, who developed aircraft such as the U-2 and SR-71 Blackbird. Johnson believed that aircraft should be repairable with simple tools under combat conditions. The principle is said to have been written on a sign in the workplace and quickly became a general principle of design.

While it was first used in engineering and design fields, the KISS principle has since been applied in many other disciplines, including software development, communication, education, and even in lifestyle and management. It is popular because it encourages efficiency and discourages over-complication.
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