"Rolled oats are a type of lightly processed whole-grain food. Traditionally, they are made from oat groats that have been dehusked and steamed, before being rolled ...
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into flat flakes under heavy rollers and then stabilized by being lightly toasted.
Thick-rolled oats are large whole flakes, and thin-rolled oats are smaller, fragmented flakes. Rolled whole oats, without further processing, can be cooked into a porridge and eaten as old-fashioned oats or Scottish oats, but more highly fragmented and processed rolled oats absorb water much more easily and therefore cook faster into a porridge, so they are sometimes called "quick" or "instant" oats." - (en.wikipedia.org 31.12.2021)