Grok is a term coined by Robert A. Heinlein in his science fiction novel “Stranger in a Strange Land” to describe a deep understanding of something. It goes beyond mere intellectual comprehension and involves becoming one with the subject matter. It means experiencing an idea, concept, or object so deeply that it becomes a part of oneself. Essentially, grokking is a process of full immersion in something, be it a topic, a person, or an experience. To grok something is to have a profound understanding of it at a fundamental level.