ES File Explorer File Manager (as of 2020 and even now, though its reputation has significantly declined) was a popular file management app for Android. It offered a wide range of features beyond basic file browsing, including :

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File management:

Standard functions like copying, moving, deleting, renaming, creating folders, etc.
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Network access:

Connecting to and managing files on various network locations (like FTP, SMB, WebDAV).
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Cloud storage integration:

Accessing files stored in cloud services such as Dropbox, Google Drive, and OneDrive.
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Root explorer:

(Requires root access) Allowing users to access and manage system files.
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Task killer:

A tool (often criticized for being unreliable and potentially harmful) to close background apps and processes.
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App manager:

Viewing and managing installed applications.

Important Note:

While ES File Explorer was once very popular, it[SQ]s crucial to understand that

its reputation has been severely damaged due to concerns about intrusive advertising and potentially malicious behavior.

Many security researchers have highlighted issues with its privacy practices and the inclusion of potentially unwanted programs (PUPs). Therefore, it[SQ]s strongly advised to avoid using ES File Explorer, and instead opt for more reputable and trustworthy file manager apps from well-known developers. There are many excellent alternatives available on the Google Play Store.