Konqueror is KDE's file manager and it also functions as a fully featured web browser. Just enter an Internet address into the Location field and press "Enter".

To return to a previous web page, press the "Back" button in the toolbar. To display your home directory in the local filesystem, press the "Home" icon.

Choose the "Help" menu (or "F1" key) to access the Konqueror Handbook which contains extensive documentation and helpful tips about using the file manager and browser.