Answer / Kum Anshu Gupta

Passing by value means a copy of the variable is passed to the function. If the variable is modified within the function, the original variable remains unchanged.nnPassing by reference means the address of the variable is passed to the function. Any changes made in the function affect the original variable.nnHere's an example:n```csharpnvoid SwapValuesByValue(int a, int b) {n int temp = a;n a = b;n b = temp;n }nvoid SwapValuesByReference(ref int a, ref int b) {n int temp = a;n a = b;n b = temp;n }nint x = 10;nint y = 20;nSwapValuesByValue(x, y);nConsole.WriteLine("x: " + x + " y: " + y);nSwapValuesByReference(ref x, ref y);nConsole.WriteLine("x: " + x + " y: " + y)n```

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