Server and Client Component Boundary
Server Components run only on the server, can touch data sources directly, ship no JS to the browser — and therefore cannot use hooks, state, or effects. The 'use client' directive marks the boundary where interactive hook-using components begin; only serializable props may cross it, and the hooks lifecycle exists exclusively on the client side.
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Server Components run only on the server, can touch data sources directly, ship no JS to the browser — and therefore cannot use hooks, state, or effects. The 'use client' directive marks the boundary where interactive hook-using components begin; only serializable props may cross it, and the hooks lifecycle exists exclusively on the client side.
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