what is string x2 in c#

what is string x2 in c#

static string GetMd5Hash(MD5 md5Hash, string input)
        {            
            byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(input));            
            StringBuilder sBuilder = new StringBuilder();            
            for (int i = 0; i < data.Length; i++)
            {
                sBuilder.Append(data[i].ToString("x2"));
            }            // Return the hexadecimal string.
            return sBuilder.ToString();
        }

2020-02-28