troubleshooting Question

Understanding RAM, SD Card and Device Memory of an smartphone

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miyahiraFlag for Peru asked on
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I have an Android smartphone and would like to understand what is the difference between RAM, SD Card and Device Memory.
When I check Memory Usage of my smartphone, I see those components:

RAM: 174 used      and   52 MB free

On SD Card: 492 MB used     and   3.16GB free

Device Memory: 143 MB used   and   47 MB free

I understand that "SD Card" is some external memory that you put in the Smartphone.  But how do I understand RAM and Device Memory?
Joshua Grantom
Systems Administrator
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