This section allows you to pass internal information as part of the URL. If you don't see an option, ask the administrator to enable it in Site administration >Plugins >Activity modules >URL. You can also have 'in frame' or 'New window' but these must be enabled by the administrator. If you select this one, then you can specify the pop-up width and height. In pop-up - Same as 'Open', but opens a new browser window to show this file (without the Moodle heading, blocks, etc.) - this browser window also does not have all the menus in it.shows image, PDF, flash animation, taking up the whole browser window) Open - No Moodle heading, blocks, footer or description - just show the file in the web browser (e.g.Show the title/description of the item and display the file directly in the page as well Embed - Show the Moodle page with heading, blocks and footer.Automatic - Make the best guess at what should happen (probably what is wanted 99% of the time).
In External tool, type the full web address of your URL or click the Choose a link button for more options.
Give the URL a name and a description if required, checking the box if you want the description to display on the course page.