What is a one-sentence summary of the following article?
You’ll usually find this app on the home screen. It’s at the top of the screen. A list of apps currently syncing to your iCloud will appear.  Apps that are synced display the {"smallUrl":"https:\/\/www.wikihow.com\/images\/1\/15\/Iphoneswitchonicon1.png","bigUrl":"\/images\/thumb\/1\/15\/Iphoneswitchonicon1.png\/46px-Iphoneswitchonicon1.png","smallWidth":460,"smallHeight":300,"bigWidth":"46","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of an iPhone\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"} On switch. Apps not synced display the {"smallUrl":"https:\/\/www.wikihow.com\/images\/2\/25\/Iphoneswitchofficon.png","bigUrl":"\/images\/thumb\/2\/25\/Iphoneswitchofficon.png\/47px-Iphoneswitchofficon.png","smallWidth":460,"smallHeight":294,"bigWidth":"47","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of an iPhone icon\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"} Off switch. A confirmation message will appear, asking what you want to do with the existing data. Tap Keep on My iPhone to keep the data, or Delete from My iPhone to get rid of it.

Summary:
Open your iPhone or iPad’s Settings . Tap Apple ID. Tap iCloud. Slide the switch for an app you don’t want to sync to the Off  position. Select an option.