It means cheap substitute. Some big-name products have a very good use effect or experience. For example, some big-name skin care products in cosmetics have good skin care effects. But at the same time, big-name products are generally more expensive, so some people will look for cheap alternative versions of big-name products, that is, the price is much cheaper than big-name products, but the effect is the same or almost the same as big-name products. In particular, some online bloggers will find many substitutes. On the one hand, some bloggers are more professional and have more products in a certain field. On the other hand, it is also recommended to fans who like themselves, or advertised.