Is Ram of Android devices actually increased

Android devices Ram are predefined.... Those hardware are pre-installed..... Means a 16gb card is capable of only 16gb.... It's can't be expanded... Nor any other storage device can split nd give its storage to it....... Like this only.... Same about ram concept..... Ram is predefined.... Nd it can't be increased..... Ram is based on processor capacity.... Means it's working process is defined by processor.... So it can only be used when that much amount of ram is needed for a certain task.....
  Some people increase their ram by rooting the devices.... Nd expanding the ram memory by splitting SD cards... And giving that memory as a ram..... Procedurely it's correct... But technical it's not working..... Bcz both are different... So the processor uses only the hardware ram which is pre-installed.... Nd this virtual ram is not used..... So actually this ram  which is made from SD card is not used at all....
  So guys the concept of ram expansion by SD card partition is fully wrong.... Technical it can't be done.... So guys pls don't waste your time in doing ram expansion....
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