Clean Master (now often referred to as Cheetah Mobile[SQ]s cleaner apps) is a suite of mobile apps, originally developed by Cheetah Mobile, that offered various cleaning, security, and optimization features for Android devices. These features historically included :

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Junk File Cleaning:

Scanning and removing temporary files, cache data, and other files deemed unnecessary to free up storage space.
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Antivirus Protection:

Scanning apps and files for malware and viruses. The effectiveness of this feature has been debated.
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Applock:

A feature to protect apps with a password or other authentication method to prevent unauthorized access.
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Performance Boost:

Claiming to optimize device performance by closing background processes. The actual impact of this is often minimal and can sometimes negatively affect device functionality.

Important Note:

While Clean Master was once a popular app, it has faced considerable criticism and controversy over the years, primarily concerning:

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Overstated claims:

The effectiveness of its cleaning and security features has been questioned. Independent tests have shown that its antivirus capabilities were often less effective than other antivirus solutions.
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Privacy concerns:

Concerns have been raised about the app[SQ]s data collection practices and potential sharing of user data.
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Aggressive advertising and push notifications:

Clean Master was known for its intrusive advertising and frequent push notifications.

Currently, Cheetah Mobile has largely phased out the "Clean Master" branding

in favor of other apps with similar functionality, but under different names. Therefore, if you see an app claiming to be "Clean Master," it might be an outdated version or a completely different app trying to capitalize on the name recognition. It[SQ]s crucial to exercise caution when installing such apps.

If you[SQ]re looking for cleaning or security features for your Android device, it[SQ]s recommended to research and choose reputable apps from well-known and trusted developers with a strong privacy policy. Look for apps with positive reviews and independent verification of their claims.