Okay, so imagine you have a toy box filled with different toys like blocks, Legos, and stuffed animals. Now, imagine your friend comes over and brings their toy box which has different toys like dolls, action figures, and cars in it.
If you and your friend were to mix your toy boxes together, you would have a "coproduct" of toys. It's like a big group of toys that includes everything from both of your toy boxes combined.
In math, a coproduct is similar. It's a way of combining two sets of things into a bigger set that includes everything from both sets. This can be helpful in things like algebra and calculus.