var vs dynamic

1.var
Type is decided at compile time
Strongly typed
Must be initialized at declaration
IntelliSense & compile-time checking available
Example
var x = 10; // int
var name = "Ram"; // string
👉 If you assign a wrong type later → compile-time error

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2.dynamic
Type is decided at runtime
Not strongly typed
No compile-time checking
Errors occur at runtime
Example
dynamic x = 10;
x = "Ram"; // allowed
x.DoSomething(); // runtime error if method not found

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3.Key Differences (Interview Points)

Feature	var	dynamic
Type resolution	Compile time	Runtime
Type safety	Yes	No
IntelliSense	Yes	No
Error checking	Compile time	Runtime
Type change allowed	No	Yes

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4.When to use?
Use var when type is obvious and you want clean code
Use dynamic when working with:
COM objects
Reflection
JSON / loosely typed data

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5.Important interview one-liner

var is statically typed, dynamic is dynamically typed.