An object code optimizer is like a magic machine that takes a program that you wrote and makes it better. When you write a program, it's like building a big Lego castle with lots of pieces. But sometimes, there are too many pieces or they don't fit together perfectly, so the castle is slow and not very fun to play with.
That's where the object code optimizer comes in. It takes apart your castle piece by piece and puts it back together in a way that makes it faster, more efficient, and easier to play with. It looks at each piece and figures out if there's a better way to connect it to the other pieces, or if there are some pieces that can be taken out altogether.
So imagine you have a castle with a lot of blue blocks, but the blue blocks are really heavy and make it hard to move the castle around. The optimizer might come in and swap out some of the heavy blue blocks for lighter red blocks that work just as well. Or it might notice that you have two towers that are exactly the same, so it takes one of them away to make the castle simpler and faster.
In the end, you still have your Lego castle, but it's now faster and easier to play with. The object code optimizer is like a master builder that knows how to make your castle shine.