Difference between ELT & ETL Architecture

ETL versus ELT Architecture.

Extract -- the action of reading data from a database.
Transform -- the action of transforming the extracted data from its previous form into the resultant form.
Load -- the action of writing the data into the target database. 

Difference between ELT & ETL

Column1	ETL	ELT
Approach	Traditional	Modern/Future
Transformations	Row-By-Row	Bulk
Data Movement Throgh Network	Twice	Only Once
Engine(Staing server)	Require	Not Required
Database Performance	No need to be high	Should be high
Licensing  cost	High	Comparitively Low
Examples	Datastage,Informatica	ODI/ Sunopsis