What is does ELT stand for?
ELT stands for extract, transfer and load.  This refers to a data flow lifecycle.  Extract refers to extracting data from source system of records, load refers to the process to load the data into another system, and transfer stands for the process load the data into that new system.  ELT also describes a process for loading source data into another system of record that is stored in the original format as the source system.