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Depending on if your device has the ability to see a new iOS, then
you may be able to update or upgrade to later versions of apps.
If your device cannot go past some older iOS due to hardware limit,
then you may not see any update to existing apps; except perhaps
there may be security update for some system apps or browser.
Learn how to update your iPhone, iPad, or iPod touch
to the latest version of iOS—wirelessly or using iTunes.
What kind of apps were you attempting to get new or updated versions?
As suggested, use the App store in your iOS device for available apps.
All topics, resources, & options you need for Apple apps.
Because your thread appears in iPhone, if the phone is older it won't see
update or upgrade to later iOS. My old iPhone 5C won't go past iOS10.3.x
and my old iPad Mini1.1 wi-fi can't use newer than its last iOS9.3.x.
Use the App Store to ... Through the App Store, you can download new apps
for your iOS ... Your Apple ID is the account that you use to access ...
Sometimes, it's possible for apps like Safari, Camera, or App Store to disappear
from your iPhone... Lifewire How to Get Missing... kind of content you can access ...
Without details, the suggestions would be based on obvious possibilities.
Good luck & happy trails! 🙂
Question: I can't update my applications on the iTunes and apple store