All-pairs testing is like playing a matching game with different things that need to be tested. You know how when you play a matching game, you need to find two cards that are the same? All-pairs testing is like that, but instead of matching cards, you are trying to match different inputs that need to be tested.
The inputs could be anything, like the different options on a website, the different settings in a software program, or the different features of a product. All-pairs testing helps you make sure that you test all possible combinations of these inputs, even if there are a lot of them.
It's like having a big puzzle with lots of pieces. If you try to test each piece one at a time, it might take a really long time to test everything. But all-pairs testing helps you fit pieces together in a way that allows you to test more things at once, like if you tried to match two jigsaw puzzle pieces that fit together.
All-pairs testing helps you save time and effort, because you can test more things at once and make sure that you find any problems that might come up. It's like being a super detective, trying to find all the clues and make sure you solve the mystery of what might be wrong with a product or a software program.