var vs dynamic vs object – C# Interview Must-Know

var, dynamic, and object look similar in C#, but they behave very differently at compile time and runtime—and misunderstanding them can easily cause bugs, performance issues, or runtime errors. In this video, we break down var vs dynamic vs object in a clear, practical, and interview-focused way. 🔍 What you’ll learn: What var actually means (and what it does NOT mean) How dynamic defers type checking to runtime Why object is the base type of all C# types Compile-time vs runtime behavior (with real examples) Performance and safety differences Common mistakes developers make in interviews and production code When to use var, dynamic, or object in real projects 💡 Key Interview Points Covered: Is var strongly typed? ✅ Why dynamic can cause runtime exceptions ⚠️ How boxing/unboxing works with object Which one is faster and safer? Which one should you avoid in enterprise applications? 👨‍💻 Who should watch this: C# / .NET developers Freshers preparing for interviews Experienced developers revising fundamentals Anyone confused about C# type inference This is a must-know C# concept asked frequently in technical interviews, code reviews, and real-world .NET applications.