Okay, picture this:
You're playing with your toys and your friends. You start talking about your favorite toy and why you love it so much. Your friends join in and start saying why they love their toys too.
That's basically what discourse analysis is all about - it's looking at how people talk about things and what they say about them.
Now, Foucauldian discourse analysis is a way of looking at how people talk about things in order to understand power relationships - who's in charge, who gets to decide what's true, and who gets to have their voice heard.
It's like if your friends started to tell you that your toy wasn't actually that great, and no one really cared about it. They might not say it outright, but the way they talk about their own toys and ignore yours shows that they have the power in the situation.
Foucauldian discourse analysis would look at the larger social context behind your play date and examine why your friends have the power to determine what is "good" or "bad" when it comes to toys. It would investigate how different people's voices are heard and valued in conversations about toys, and how this reflects wider power dynamics in society.
So basically, Foucauldian discourse analysis is about looking at how language shapes social relationships and power dynamics, even in something as seemingly simple as a conversation about toys.