upgrade vs dist-upgrade

[Daniel Carrera]

Hello,

I was hoping someone could tell me more about the difference between an 
upgrade and a dist-upgrade.

I know that upgrade is safer, I know that dist-upgrade is intended for 
upgrading the distro (e.g. Breezy to Dapper). I know that dist-upgrade 
does a more agressive dependency resolution and that might break things, 
but this agressiveness is necessary when you upgrade to a new distro 
(e.g. Dapper).

But could someone give me a concrete example (made up examples are fine) 
of something that dist-upgrade would do but upgrade would not? I want to 
know more about what's happening under the hood.

Thank you for the help.

Cheers,
Daniel.
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