“Suppose you’re browsing the Web and you find a seminar advertised, and you decide to go. Now, there is all sorts of information on that page, which is accessible to you as a human being, but your computer doesn’t know what it means. So you must open a new calendar entry and paste the information in there. Then get your address book and add new entries for the people involved in the seminar. And then, if you wanted to be complete, find the latitude and the longitude of the seminar, and program that into your GPS [Global Positioning System] device so you could find it. It’s very laborious to do all this by hand. What you would like to be able to do is just tell the computer, ‘I’m going to this seminar.’ ”
So that’s what it does.
(From Technology Review)