A hyperlink is a underlined piece of text or a area on a picture that when "left clicked" will take you some where else, 

you just used a hyperlink to get here.

Hyperlinks appear in different colours to the surrounding text, blue for one you have not used before, Turquoise for one you have used before, and they turn green just as you click them. (colours differ on each web site).

to return to the home page click back (its a hyperlink).