Frontend vs Backend
also client-side vs server-side
Frontend is the part of an app users see and interact with in the browser, while backend is the server-side logic, data, and APIs that power it behind the scenes.
Analogy
Like a restaurant's dining room (frontend) versus its kitchen (backend).
Why it matters
Knowing the split helps you place automation logic correctly and understand where webhooks, APIs, and data actually run.
In practice
A funnel page (frontend) submits a form that a backend API receives and stores in a database.