API's are a way to connect your alexa skill to third party applications, such as linkedin,
twitter, bbc, flickr, and many more. This allows you to display information from these sites
on your skill.
The picture used in this skill is taken from Matthew Cackett (mattc68).
This example is of using the flickr api in your skill which allows you to link your skill
to flickr. This will make it so that you are able to show pictures from the site on your skill.
This makes it possible for us to make a personal gallery skill, so that all the images you
upload to flickr can be browsed through all from your skill. You could also make it so that
the user could say the username of any account and search through all the public photos thats
been uploaded to that account.