A file manager or file browser is a computer program that provides a user interface to manage files and folders.

What does a file manager do?

The file manager displays the file/folder hierarchy, and it provides functions to create, copy, move, rename and delete folders as well as copy, move, rename and delete files. A file manager creates folders, not files; applications create files.

Do I need file manager on my phone?

Android includes full access to a file system, complete with support for removable SD cards. But Android itself has never come with a built-in file manager, forcing manufacturers to create their own file manager apps and users to install third-party ones.