"Void" guides main method not to wait for any return types. It will simply execute the operations in the block.

static void Main()
{
    //...
}

This code forces the main method to return one integer value. For example, if you pass two numbers and expect the sum of those from a method, you can make use of the specific return types.

static int Main()
{
    //...
    return 0;
}

Main method welcomes arguments also for a efficient program.

static int Main(string[] args)
{
    //...
    return 0;
}