When you have creamed together butter, sugar and vanilla, after you have completed beating in the eggs, when the flour, baking soda and salt have all been stirred together, and the creamed mixture has been gradually added in, you now have the basic dough of a cookie. But those are not the final ingredients. You now have a decision to make: Do you want to add chocolate chips? If you leave them out you will still have a cookie and it will taste pretty good; but if you add them in it will make the cookie gooey and chocolatey and all-the-more delicious.
Chocolate chip cookies are just cookies if you don’t add the chocolate chips. They’ll still have some good taste and can be warm, but you will miss out on the melted chocolate that is featured in a chocolate chip cookie. You can leave them out if you want, but I don’t recommend it.