Lets face it, Android doesn't have the same functionality as personal computers when it comes to managing files, therefor: we have many different "FileManagers Apps" on Google Play.

This app provides the following uses:
Read/Write text files on your SD card.
Copy photos from camera directory to another folder so that prying users cannot simply delete photos from your gallery. ;-)
Read your devices configuration files directly. (If you were curious)
Select files to be sent via Bluetooth to nearby Android devices, PC's or any other device capable of receiving Bluetooth file push.
Extract contents of zip files.
Archive a folder and all of its sub-contents into a zip file.
Extract a file from a 7z compressed file.
Use LZMA compression to create a 7z file. (Try to use levels 0 through 7 when using this feature. Levels 8 and 9 may be too much for your Android device.)