Google Play vs an APK file: what changes?
An APK is an Android installation package. A Google Play page is a store record from which a compatible device may install an application. They describe different parts of the installation process.
Following a Google Play link
Check the publisher, supported device, age guidance and permissions on the store page. If the store says an app is unavailable, a directory cannot make it available to your account.
Checking a separate APK source
Identify who provides the file, whether the developer links to that source and how updates are distributed. A matching file name or logo does not establish authenticity. Do not disable a security warning simply because a download page asks you to.
Before granting permissions
Consider whether each permission fits the function you want to use. A basic card game asking for unrelated sensitive access deserves a closer look. Review permissions again if an update changes what the application requests.
RummySEO links to store records and does not host APK files.