how the system upgrading works on ubuntu

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i'm little bit confused about how the upgrading or updating works. let's say im currently using ubuntu and one opened app which is firefox and im updating the system. after the upgrating is done im still using older version of ubuntu and firefox without any trouble. how is this possible. am i currently working on the programs which have loaded to the RAM? as far as i know if we run a program, the whole thing is not loaded to the RAM therefor i think it's not possible to work that fine on the RAM without loading from the hard disk. im glad if any one can explane me this.

asked 1 min ago

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how the system upgrading works on ubuntu