Cheap is the comparative form of the adjective "cheap". It is used to compare two things, stating that one is less expensive than the other. When something is cheap, it means that it is low in cost or price.
For example, if you are comparing two similar products and one is cheaper than the other, you would say that the cheaper product is the more affordable option. In this case, you are using the comparative form of cheap to show that one product is less expensive than the other.
The comparative form of cheap can also be used to describe the quality of something that is inexpensive. For example, you might say that a cheaply made product is even cheaper in quality than a slightly more expensive, higher-quality product.
Overall, the comparative form of cheap is used to compare the cost or quality of two things, showing that one is less expensive or of lower quality than the other.