What is use of SQLBulkCopy Class in C#

protected void Button1_Click(object sender, EventArgs e)  
{  
    try  
    {  
        string cs = ConfigurationManager.ConnectionStrings["SchoolConnectionString"].ConnectionString;  
        using (SqlConnection sqlConn = new SqlConnection(cs))  
        {  
            DataSet ds = new DataSet();  
            ds.ReadXml(Server.MapPath("~/Data.xml"));  
            DataTable dtStudentMaster = ds.Tables["Student"];  
            sqlConn.Open();  
            using (SqlBulkCopy sqlbc = new SqlBulkCopy(sqlConn))  
            {  
                sqlbc.DestinationTableName = "StudentMaster";  
                sqlbc.ColumnMappings.Add("Name", "Name");  
                sqlbc.ColumnMappings.Add("Phone", "Phone");  
                sqlbc.ColumnMappings.Add("Address", "Address");  
                sqlbc.ColumnMappings.Add("Class", "Class");  
                sqlbc.WriteToServer(dtStudentMaster);  
                Response.Write("Bulk data stored successfully");  
            }  
        }  
    }  
    catch (Exception ex)  
    {  
        throw ex;  
    }  
}