Thank you so much, Don E from Michigan. For your definitive, logical explanation of 'indexes' or 'keys' or 'elements' and 'associative array' meanings. I felt like i learned something which was not clear in my mind before.I have a question,You wrote the code look like this in comment.php file, 1#)- $sql = "INSERT INTO comments (FirstName, LastName, Comments) VALUES ('$firstName','$lastName','$comments')"; In php lessons, as far as i know in order to get PHP to execute any statement we must use the mysql_query() function.This function is used to send a query or command to a mysql connection. And i would write the statement something like this. 2#) - db_query("INSERT INTO comments(FirstName, LastName, Comments)VALUES('$firstName' , '$lastName' , '$comments')"); Now i am confused on which way to wright the statement.I would appreciate if you tell me why it is so something like in 1#)