I deleted the realtor.com app but when I go to the website , it still defaults to the app ( which I don’t like and that’s why I deleted it ) . How do I get it not to default to the app ?

Swipe left until you get to the App Library, tap the search field and see if you can find the app. If you can, it's still on your iPhone.

OR

Swipe downward from any Home Screen and type the app name into the search field, if you can open the app from there, it's still on your iPhone.

OR

Go to Settings > General > iPhone Storage and if you find it there, it's still on your iPhone

OR

Go to the App Store and search for the app, if it shows 'Open', then it's still on your iPhone.

review this support article

How to delete apps on your iPhone, iPad, and iPod touch - Apple Support

• You can delete an app from your Home Screen by tap/hold on the app icon, when the menu pops up, select Remove App, then in the subsequent menu select Delete App
• You can delete an app from the App Library by locating the app and tap/hold, select Delete App.
• You can delete an app by navigating to Settings > General > iPhone Storage > [app name] scroll all the way down to the bottom and select Delete App.

If you are unable to delete apps with any of these methods, check:

Settings > Screen Time > Content & Privacy Restrictions > iTunes & App Store Purchases > Deleting Apps

make sure that's set to 'Allow'

No problem, glad to be of help!

I like the App Library because I have a few hundred apps and I can utilize it to clean up my Home Screens by 'Removing' the rarely used apps, which makes the Home Screens easier to look at and navigate. But when I need to use one of those apps again, I can just swipe over to the App Library and access it.

If you only have a handful of apps, it might not be all that useful for you.

Please contact the Web Publisher or the web host.

When you say 'it defaults to the app'.. are you saying that it opens the app?

If so, then the app wasn't actually deleted from your phone...