After-market

After-market refers to any market where the customers who implement one product or service are likely to purchase a related, follow-on product.

Example

An example would be as follows: Jim buys a new computer. He then feels the need to have a wireless keyboard and mouse, so he purchases these for his new computer, along with some speakers and a privacy screen. The wireless keyboard, mouse, privacy screen, and speakers are all considered After-Market products.