Backlink
A link from someone else's site pointing at yours. Search engines read it as a vote, and votes from trusted sites count most.
See it
What it is
A backlink is a link from another domain pointing at yours. Search engines have treated links as endorsements since PageRank in 1998: a page that trusted pages link to gets treated as more trustworthy itself. Not every link passes that value. Links marked nofollow, sponsored, or ugc tell crawlers to discount the endorsement, which covers most comment threads, press releases, and paid placements.
What actually earns them: original data, a free tool people bookmark, a strong opinion others cite when they argue, and being the obvious reference for one narrow subject. Relevance beats volume. One link from a respected site in your topic outweighs fifty from unrelated directories.
Gotcha: link schemes are the fastest route to a manual penalty. Bought links, reciprocal 'you link to me, I link to you' swaps, and private blog networks are exactly what spam systems are tuned to catch. And a hard-won backlink pointing at a URL you later delete, or bounce through three redirect hops, leaks most of its value. Keep your URLs stable.
Ask AI for it
Build a backlink acquisition plan for [site], which covers [topic]. Give me: (1) three linkable assets worth making (original data, a free calculator or tool, a definitive reference page), each with a one-line pitch for why anyone would cite it; (2) 15 concrete link targets by type (industry newsletters, niche roundups, resource pages, podcasts, unlinked brand mentions, competitor backlinks worth replicating); (3) a short outreach email for each type, under 120 words, no flattery padding. Exclude anything that involves paying for links, link exchanges, guest-post networks, or directory blasts.