The console object offers access to the browser's debugging console, which is the most frequent usage among developers. How it works differs from one browser to the next, but there is a standard set of functions that most browsers support. console.log and other consoles are the most prevalent.
Incremental Static Regeneration (ISR) is a new feature that allows you to regenerate static pages while they're running. It's a mix of Static Site Generation (SSG) and Server-side Rendering (SSR).