Sheereen, I was always told that a Black Hole was a place where my money or lost items apparently disappeared without trace. But I think your question deserves a different answer. I asked my friends about it. I shall also ask them to avoid science fiction stories where Black Holes seem to be used in a variety of stories. Do Black Holes really exist I might ask?
My friends are right. The denser (more compact) the mass (think about mass and weight) of an object the greater its gravitational pull. So when the Sun collapses into itself you have a object that gets very small and very, very dense so it’s gravitational pull increases and it begins to pull everything in towards it. when something is pulled into it (including light) where it goes to is a mystery. It may add to the mass of the collapsed Sun and make a stronger black hole by increasing the gravitational pull. OR as the Science Fiction writers would suggest it takes you to a new dimension. Thank you for your question Sheereen.