What is the MaterialApp widget and what does it configure?
Why Interviewers Ask This
This question tests conceptual clarity. Interviewers want to hear a precise, confident definition before moving to more complex Flutter topics. It also reveals how well you can explain technical ideas to non-experts.
Answer
MaterialApp is the root widget for Material Design apps. It configures app-wide settings including the theme (colors, fonts, shapes), routes (named navigation routes), locale (language/region), debugShowCheckedModeBanner, and the initial screen (home). It also sets up the Navigator for managing screen transitions. Every Material app should have exactly one MaterialApp at its root.
Pro Tip
Before answering, structure your response: one-line definition → real-world analogy → concrete example from a project. This makes even complex Flutter answers easy to follow.