Dell Drivers & Downloads says there are updates and the Dell Update application says system's up to date now which is the correct source as both are DELL resources?

Hi,

I am in ambiguity as to which update to download and from where.There are basically two resources for Dell driver's download from Drivers & Downloads and next is the Dell update application.

First under the dell support site/Drivers & Downloads gives me that there is updates to be downloaded whereas in the Dell Update application says my System is up to date.So from where is the correct resource if the Drivers & Downloads is the correct resource then why is it not reflecting the same updates in the Del Update applicaton

Secondly if I go ahead with the online Drivers & Downloads there are a slew of updates ,do I need to download all of them or only a part of it is needed to download/

Third Based on what is the dell drivers update downloaded is it by matching the hardware of the laptop or something else