What does "rooting" mean?

Increased Galaxy J5 mem from 6 Ggs to 14.4 but only the internal mem gets fed - not the extended. Read about "Rooting". Does that mean that both the internal and external mems function as one mem under the "root"?

Re: ONLY the internal NATIVE memory gets updated:

What that means is this:

Next time I buy a cell or replace my current one, I should get one with a BIG internal memory. That's it. The EXTERNAL one is only for secondary appls like WAZE and WHATSUP.

Just got the answer from Samsung Tech Support in Jordan:

Some Cell applications can ONLY (!) run in internal NATIVE memory. That is why ONLY the NATIVE memory gets updated. Not the EXTERNAL.

I have manually moved theĀ  Whatsup and Waze applications to the external card - with no solution to the internal-only memory getting updated. I don't store pics in my cell bc of low storage capabilities. I need to know how to "root" something so both the internal and external memories become one-only big memory in my cell.

Rooting is the process of allowing users of smartphones, tablets and other devices running the Android mobile operating system to attain privileged control (known as root access) over various Android subsystems. As Android uses the Linux kernel, rooting an Android device gives similar access to administrative (superuser) permissions as on Linux or any other Unix-like operating system such as FreeBSD or macOS. (source: Wikipedia)

Apps that allows you to move other apps to SD card needs root access. With regards to your phone's storage, have you tried moving your files (photos, videos, audios) to SD card? Use a file manager app to move them.

Just enter why to root a phone in google search u will get answer to what  is rooting

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