Server Components are the default in the App Router and run on the server, so they’re great for data fetching and reducing client JS. Client Components are needed for state, effects, event handlers, or browser APIs. Use `'use client'` only where necessary.
Expanding on the short answer — what usually matters in practice:
A tiny example (an explanation template):
// Example: discuss trade-offs for "server-components-vs-client-components:-when-do-"
function explain() {
// Start from the core idea:
// Server Components are the default in the App Router and run on the server, so they’re grea
}