A collection of websites or pages created primarily to generate manipulative artificial links.
A link farm is a collection of sites or pages created mainly to produce artificial links rather than useful independent resources. The important issue is purpose and behavior, not simply that several websites link to one another. Legitimate organizations can have connected sites and still provide distinct, valuable information.
Google’s link-spam policies address arrangements designed to manipulate rankings. A network of interchangeable pages whose main function is to place links deserves different scrutiny from a genuine directory with clear inclusion standards or a group of related organizations serving their audiences. Visual polish or a high third-party score does not resolve that distinction.
For a business owner, the risk often appears in an offer rather than a technical report. A seller may promise a large number of placements without identifying the publications, editorial process or audience. If the product is mainly artificial ranking influence, an impressive delivery count does not make it a sound marketing investment.
Takeaway: Ask why each linking site exists and who uses it. Decline placements whose main justification is manufacturing search signals rather than providing a useful reference or legitimate advertisement.
Example
A supplier is offered links from dozens of unrelated sites that reuse the same generic articles and routinely insert paid keyword links. It compares that offer with a relevant trade directory that explains its membership criteria and provides practical business information. The two arrangements should not be judged only by quantity.
What to check
Review actual sample pages and the placement terms before purchase. Do not assume a network is legitimate because its domains have different names. If previous work involved manipulative placements, preserve records and obtain a careful assessment rather than making indiscriminate removal or disavow decisions.
For more detail, see Google link spam policies.