What is the difference between var and dynamic in C#?

var is a compile-time keyword that allows type inference by the compiler — it’s strongly typed, and the actual type is fixed once assigned. It improves code readability, especially for LINQ or long type names.

dynamic, on the other hand, defers type checking to runtime. It's useful when working with COM objects, dynamic JSON, or using ExpandoObject. However, it comes at the cost of performance and no compile-time safety, so I use it only when truly necessary.

I prefer using var in most cases because it’s type-safe and gives full IntelliSense support. I use dynamic sparingly — only in places where runtime flexibility is needed

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