Link exchange is a practice or service that aims to facilitate the process of acquiring and managing inbound and outbound links between different websites. In its classic form, it means that two or more sites exchange hyperlinks with the aim of mutually improving their positions in search engine results and increasing organic traffic.
In the context of SEO, link exchange is often used to quickly build a link profile, with the optimizer purchasing or negotiating inbound links (backlinks) and the webmaster providing outbound links from his site. In the past, this was an effective strategy, but today search engines such as Google actively restrict such practices, as they can lead to manipulation of rankings.
Properly executed, link exchange can be useful when it is natural and thematically relevant – for example, between sites with a similar audience and content quality. Otherwise, it can lead to penalties and a decline in domain authority. Therefore, the modern approach to link building relies more on organically built links through quality content, PR, and partnerships than on direct link exchange.