The much talked about "Deep State" What is it?

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Today in a conversation with someone he said: "The deep state controls everything!" but in the context in which he said it I thought he meant the deep state as something completely different from conspiracy theory.
The deep state refers (according to conspiracy theories) to the existence of a large structure that operates within governments and institutions, doing so independently and autonomously operating at a national or international level, (I remember "The Company" from Prission Break).

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The deep state is operated by high-ranking government officials, intelligence agencies, high-ranking military personnel, and influential people in the economy, who act in a network based on their interests, which may or may not be in accordance with the will of elected officials or citizens.

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The idea of the "Deep State" originated in Turkey but is best known for its popularity in the United States. It refers to the group of people or institutions that claim to maintain the stability of a country by protecting it from different interests.
The conspiracy theory says that this power works in the shadows to maintain power and thus manipulate the different spheres of a nation, even manipulating democratic elections.