If a hyperlink refers to another website it is called external link. Inbound links are incoming links and outbound links are outgoing links. In contrast, an internal link refers to another spot of the internet address. External links allow users a fast connection to other websites. If there is an event, it is very convenient if a link to a route planner is at hand. The praxis shows, that it is advantageous for users if the process of the quitting of the actual homepage and the change of the sites are shown. If the visitor doesn’t find the way from the route planner to the actual page, because of the frustration he might look for another supplier. Numerous and wise external links to other domains are the most important thing for a good ranking in search engines. This is why you should configure your homepage with such wise links. Besides the route planner, which was already mentioned above, this links can be literature hints, lexicon entries and other links.