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Not invented here syndrome (NIHS) is a mindset or corporate culture that favors internally-developed products over externally-developed products, even when the external solution is superior.
NIHS is frequently used in the context of software development, where a programmer will overlook all the attributes of an existing solution simply because it wasn't produced in-house.
It's a common belief in Silicon Valley, and the tech world in general, that companies should "eat their own dog food", which is just a way of saying that a company should use its own products. While this makes sense at some level -- you shouldn't sell something to customers that is unfit for your own use -- the concept of NIHS is similar but takes the line of thinking to the extreme. In this sense, the term is generally used negatively and would refer to somebody whose decision-making skills are put into question because of this bias.
Explanations (and the emotions) for NHIS include: