"Hide Something" isn[SQ]t a standard or widely known photo app or feature. There[SQ]s no single app with that exact name offering photo hiding capabilities. However, many apps and operating systems offer ways to hide photos, and "Hide Something" might be :

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The name of a specific, lesser-known app:

There are numerous apps on app stores (like Google Play and the Apple App Store) that allow users to hide photos and videos within a vault or encrypted area. It[SQ]s possible "Hide Something" is the name of one of these.

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A misremembered name:

The person describing the app may be recalling the name incorrectly. Many apps with similar functionality have names like "Secret Photo Vault," "Private Photo Album," "Gallery Vault," etc.

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A feature within another app:

Some photo gallery apps or file managers might have a built-in feature to hide specific files, and someone might refer to that functionality as "Hide Something."

To find out what app is being referenced, you would need more information, such as:

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Where did you hear about it?

(A friend, a website, an advertisement)
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What platform is it on?

(Android, iOS, Windows)
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What are some other details you remember about the app?

(Its icon, its color scheme, any other features besides hiding photos)

With more detail, it might be possible to identify the specific app.