Dreamweaver is a web authoring environment which allows you to operate either in "Design View" which looks much like a browser view or in "Code View" which allows you to see the actual coding of the page. Although Design View is easier to use and OK to set up basic pages you will find that for more advanced work you will need to use Code View.
Dreamweaver is available on a number of student machines but you may wish to use one of the other pieces of web design software that you can also use on your own machine.