Okay kiddo, a semicomputable function is like a magic trick that a computer can kind of do, but not really. You know how sometimes you can do a trick with a toy that makes it disappear and then reappear? Well, a semicomputable function is like that, but with numbers instead of toys.
Basically, a semicomputable function is a function that a computer can kind of try to figure out, but it might not always work. It's like if you tried to guess what your friend was thinking, sometimes you might get it right, but other times you might be wrong. That's kind of what a semicomputable function is like for a computer.
Some numbers are super easy for a computer to figure out, like 2 + 2 = 4. But other numbers are much harder to calculate, and a semicomputable function is one of those hard ones. It's like trying to solve a really tricky puzzle that might have a solution but it's not always clear.
So even though a semicomputable function is a bit tricky for a computer, it's still really important in things like math and computer science. It's like a challenge that we can work on and try to solve, just like how we try to figure out difficult puzzles.