What did Einstein mean by “Spooky Action at a Distance"?

Einstein called it “Spooky Action at a Distance” because he thought something strange was happening between two things that were far apart, like magic, but not quite.

Imagine you have a pair of special gloves: one red and one blue. You put them in separate boxes and give each box to your best friends, Sam and Mia. They take the boxes very far away, maybe to different ends of the playground. Now, when Sam opens his box and sees he got the red glove, he instantly knows that Mia must have gotten the blue one, even though they didn’t talk.

That’s normal, right? But what if the gloves weren’t decided until someone opened the box? Like, maybe both boxes were empty at first, and only when Sam looked inside did it decide which glove was red or blue. Then Mia's glove would also change instantly, even though she wasn’t looking yet! That’s like spooky action at a distance.

Einstein didn’t believe this could be true because it felt like something was happening between the gloves without any direct connection, just like how Sam and Mia could know what each other had, without talking.