What is the Decimal.One field in C#?

// Use the System
using System;
// Create the class
class HelloWorld
{   
    static void Main()
    {
        // Print the field
        Console.WriteLine(Decimal.One);
        // Create the decimal values
        decimal decimalNumberOne = Decimal.One;
        decimal decimalNumberTwo = 3.4m - Decimal.One;
        decimal decimalNumberThree = 10.00m / Decimal.One;
        // Print the values  
        Console.WriteLine(decimalNumberOne);
        Console.WriteLine(decimalNumberTwo);
        Console.WriteLine(decimalNumberThree);
    }
}