For many businesses an app also has a web version for those users who refuse to install the app. I'm thinking my local supermarket, or kmart, they want me to i

For many businesses an app also has a web version for those users who refuse to install the app. I'm thinking my local supermarket, or kmart, they want me to install their app for some reason. I suppose it's so they can send me advertising as notifications? Many business that aren't "app only" have to have both web app and mobiles apps. App development studios love them.