What is the difference between var and dynamic in Dart?

var defines a variable whose type is automatically set based on the assigned value and remains fixed. dynamic defines a variable whose type can change during program execution.

Property	var	dynamic
Type Binding	During compilation (static)	During runtime (dynamic)
Type Change	Impossible after initialization	Possible at any time
Type Checking	Performed at compile time	Performed at runtime
Performance	Optimal	May be slightly lower due to run-time checks

Example of using var:

// Type x is defined as int at compile time
var x = 10;
// The following line will cause a compile error,
// because type of x is already defined as int
// x = "hello";

Example of using dynamic:

// Type y can change during runtime
dynamic y = 10;
// y is now of type String
y = "hello";
// y is now of type bool
y = true;

Using var is preferable when the type of the variable is known in advance, as it provides type safety and better performance. dynamic should be used only when the type is truly unknown until runtime (e.g., when working with JSON or reflection), but this can lead to runtime errors if operations are performed on a value of an incompatible type.