Yeah, No

Why do people say that? I'll ask a simple question in the cab such as "did you have a good night" and I get a reply like "Yeah , no, it was great"...... HUH?
I hear people say it all the time on TV ,on the radio, and I constantly overhear it in conversations in the Taxi.
I even hear myself say it from time to time!
Listen out for it!
What does it mean?
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