An infinite product is when you have a sequence of numbers, and you multiply all of them together, and that number doesn't end. For example, if you have the numbers 1, 2, 3, 4, and 5, you would normally multiply them together like this: 1 x 2 x 3 x 4 x 5 = 120. But if you had an infinite product, you would just keep multiplying the numbers together and there would be no end to the answer!