❔ char and character size difference

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace CS_Tutorial
{
  internal class Program
  {
    static void Main(string[] args)
    {
      string abc = "abcdefg";
      int size = Marshal.SizeOf(abc[0]);
      Console.WriteLine(size);
      Console.WriteLine(sizeof(char));
      
    }
  }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace CS_Tutorial
{
  internal class Program
  {
    static void Main(string[] args)
    {
      string abc = "abcdefg";
      int size = Marshal.SizeOf(abc[0]);
      Console.WriteLine(size);
      Console.WriteLine(sizeof(char));
      
    }
  }
}