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HerN stack stands for HarperDB, Express, React, and Node, the four technologies that make up this particular stack. Each component of the HERN stack provides a unique benefit, and data flows naturally through each of the three tiers, enabling rapid development and simple upkeep. There are also variants of this stack that would work just as well, such as swapping out and incorporating frameworks like Vue, Angular, or Fastify. There is no ultimate right or wrong answer when it comes to choosing a tech stack because it really depends on the specific use case it's meant to solve for.