Think of a juice box. When you want to drink the juice inside, you use a straw to extract the juice. Extracting means taking out something special from where it’s hiding. The juice is hiding inside the box, and you use the straw to get it out, just like how a superhero saves something special from a secret place.
Picture a treasure chest filled with shiny coins. To get the coins, you have to open the chest and take them out carefully. Extracting is like being a pirate who finds treasure and takes it out to enjoy. The coins are special, and you want to have them in your hand.
Imagine a crayon box with lots of colors. You want to use the blue crayon to draw the sky, so you pull it out from the box. Extracting is like choosing the perfect crayon for your picture. You take it out because it’s the one you need to make your drawing beautiful. Each crayon is special, and you extract the one you want to use.