Aka Memory Dump is process of dumping RAM from specific systems to disk for purpose of analysis
LIME
It is a Loadable Kernel Module (LKM) used for acquisition of volatile memory from Linux and linux based devices like Android
It supports exporting memory dump either to file system of device or over the network
Since it is a LKM, it needs to be compiled on the system which has same kernel version with of the infected system on which you want to dump memory and then it can be transfered to the infected machine