>> To prevent unauthorized traffic from leaving or entering your network
>> (or parts of it). To mask the details of how the back-end of your server
>> farm is laid out. There are many valid uses for proxies, apart from
>> caching the Google Doodle of the day to speed up the users' connection
>> and cut down on bandwidth usage.
>
> Isn't that what a firewall does?

I've been to several offices where the IT was configured with a proxy 
server as the only access to the outside world. Seems to be quite a 
common method in large organisations to control the traffic.

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