Chances are, you've sat through a few Siri commercials. A man gets instant traffic updates in his car. A boy gets the news that it's going to snow. A teenager pulls together a garage band rehearsal and gets Siri to call him "Rock God."
In real life, Siri sometimes takes awhile to think of an answer. Sometimes, it doesn't understand what the user is trying to say. Strong accents can be a challenge. Sometimes, its answers are wrong. Sometimes, it works just fine.