Extract, transform, load

Okay, so imagine you have a big pile of toys in your toy box. You want to clean everything up and organize it neatly. First, you need to take out all the toys from the toy box. This is like the 'Extract' part of Extract, Transform, Load.

Next, you start putting the toys back in the toy box, but you want to organize them by color or size. This is Transform - you are changing the way the toys are sorted.

Finally, you are putting all the toys neatly back into the toy box. This is Load - you are inserting the toys into the toy box.

In the same way, Extract, Transform, Load (ETL) is a process that helps big companies store and organize a lot of information. Information may be stored in different systems in different formats, and to make it useful, it needs to be transformed and loaded into a central system where it can be analyzed and used.

So, ETL is like taking data from different systems (Extract), cleaning it up and changing it (Transform), and then storing it all together in a central place (Load).