This may sound a bit confusing so I'll use an example.

Say I want to make a book-review website using PHP, and I want to write lots of book reviews. Instead of creating a page for every book, which could mean hundreds and hundreds, is there a way you can do this with mySQL and if so, how?

I would prefer to maybe fill out a form on a website with the 'book-review' which would enter the data into the database, and then you will be able to access this 'book-review' using a URL (in your website template of course)

Please reply and help me

In essence you do want to be uploading your data into a DB.

The web page can then simply poll the DB for information based on a query or just spit out all your records.

Whatever you want it to do its much easier to have it stored in a DB.

Take a peak at some 3 tier architecture docs to get the jist.

Ibbo