`revalidatePath` invalidates cached data for a specific route path; `revalidateTag` invalidates all cached fetches tagged with that tag. They’re used after mutations (often in Server Actions) to refresh server‑rendered data without a full reload.
Expanding on the short answer — what usually matters in practice:
A tiny example (an explanation template):
// Example: discuss trade-offs for "cache-invalidation:-what-do-`revalidatepath`-and"
function explain() {
// Start from the core idea:
// `revalidatePath` invalidates cached data for a specific route path; `revalidateTag` invali
}