Difference between inheritance and package use

[msmiller@aconcagua.src.honeywell.com (Mike Miller)]

This question came up some time ago, but has slipped my mind for one
reason or another since then:

How does (or more properly, how will) the upcoming addition of
inheritance and object oriented stuff (for lack of a better word at
the moment) differ from the definition of something in a package and
its use later?

When I was asked that, I was stumped (I'm not a software guru). Can
anyone enlighten me?

Thanks.