var enables implicit typing where the compiler determines the type from the assigned value. The variable is still strongly typed.
Best Practices:

• Use when type is obvious from assignment
• Required for anonymous types
• Use with LINQ queries for complex return types
• Avoid when it reduces code readability

var number = 42;           // int
var text = "Hello";        // string
var list = new List<int>(); // List<int>
// Required for anonymous types
var person = new { Name = "John", Age = 30 };