Answer
React treats lowercase tags as built-in HTML elements. Uppercase names indicate custom components so React can instantiate them correctly.
Quick Answer
React uses the capitalization to distinguish between built-in HTML elements (lowercase, like div or span) and custom components (capitalized, like MyButton). When React sees a lowercase tag, it renders the HTML element. When it sees uppercase, it looks for a component function or class with that name to call.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ