ELI5: etl vs elt

// eli5

What is ETL vs ELT?

ETL and ELT are two different ways to organize data, like arranging toys before or after putting them in a box [2][4]. ETL (Extract, Transform, Load) cleans and organizes your data first, then puts it away [2]. ELT (Extract, Load, Transform) puts the data away first, then organizes it later [5].

Why pick one over the other?

ETL is like cleaning your room before showing it to guests—you can check that everything is perfect beforehand [1]. ELT is faster because you don't have to organize everything before putting it away, but it's harder to check if the data is clean [1][3].

How is ETL different?

With ETL, you test and fix your data before it goes into the main storage area [1]. With ELT, you load everything quickly first and fix problems later in the storage system [3][5].

Which is better?

It depends on what you need: ETL is better when you need very clean, reliable data and have time to prepare it [1]. ELT is better when you have lots of data and need to store it super fast [3].