What is Double.NegativeInfinity Field in C#?

// use System
using System;
// create class
class DoubleNegativeInfinity
{   
    // main method
    static void Main()
    {
      // print field value
      Console.WriteLine(Double.NegativeInfinity);
      // check if negative infinity
      string result1 = -23/0.0 == Double.NegativeInfinity ? "Negative Infinity"
                       : "Not Negative Infinity";
      Console.WriteLine(result1);
      // check if negative infinity
      string result2 = 23/0.0 == Double.NegativeInfinity ? "Negative Infinity"
                       : "Not Negative Infinity";
      Console.WriteLine(result2);
    }
}