In this Next.js 15 tutorial, we dive deep into On-Demand Revalidation — what it is, how it works, and when to use it. You'll learn the key differences between revalidatePath(), Incremental Static Regeneration (ISR), and Static vs Dynamic Pages.

We also explore common problems developers face when data changes after deployment, and how to fix stale static pages without rebuilding the whole app. Whether you're building a production app, working with CMS data, or using server actions, this video will help you master Next.js caching and revalidation strategies.

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TIMELINE
0:00 – On-Demand Revalidation in Next.js
1:10 – Is On-Demand Revalidation Client or Server?
2:00 – Static vs Dynamic Pages in Next.js Explained
3:15 – Starting a Production-Level App Example
4:25 – The Problem with Static Pages After Data Update
7:20 – Fixing It Using revalidatePath() in Next.js
8:35 – Switching to Production and Testing Revalidation
10:05 – How is It Different from Incremental Static Regeneration (ISR)?
11:20 – When to Use Dynamic Page vs Static with revalidatePath