Uninstalling an app such as a game on Windows only removes that app and its own installed components. It does not delete personal files like pictures, videos, documents, or downloads that are stored in folders such as Pictures, Videos, Documents, or on the Desktop.
If any app has its own internal storage (for example, saved game data), that data may be removed with the app, but personal files saved elsewhere on the PC are not removed by a normal uninstall.
Games like “Mobi games” are not security tools and are not used to protect a laptop from hackers. Protection from malware, potentially unwanted apps, and online attacks is provided by security features such as Microsoft Defender Antivirus and related protections in Windows.
If an app is not needed, it can be safely uninstalled to reduce clutter and potential risk. For general security, keep Windows updated, keep Microsoft Defender Antivirus turned on, and avoid installing apps from sources that are not trusted.
References: