natural language generation
Also called: NLG
Natural language generation (NLG) is the branch of AI and natural language processing that turns structured or non-linguistic data into readable human text. It is the inverse of natural language understanding, and the mechanism large language models and answer engines use to write prose.
Classic NLG follows the pipeline Ehud Reiter and Robert Dale set out in 2000, refining raw intent into text across three stages.
From data to sentences
- Document planning decides what to say: content determination pulls the relevant facts, then document structuring orders them into sections.
- Microplanning decides how to say it: word choice (lexicalization), referring expressions (
the companyvsAcme), and aggregation of related facts into single sentences. - Surface realization applies grammar, morphology, and punctuation to output the final string.
Early systems filled templates by rule. The field then moved to data-driven neural methods, from Markov chains through RNNs and LSTMs to the Transformer architecture (2017), and today large language models perform NLG end to end, learning the mapping from input to text rather than following hand-written stages.
NLG is the mirror image of natural language understanding (NLU): NLU reads and extracts meaning, NLG produces language. You see it in chatbots, automated financial and sports reporting, product-description generation, and, most relevant for search, the answer synthesis behind AI Overviews, ChatGPT, and Perplexity, which read several pages and generate one written response instead of a list of links.
How it affects your traffic
AI Overviews, ChatGPT, and Perplexity all use NLG to compose their answers, and they build those answers from the pages they can read and trust. If your content is structured, factual, and easy to extract, the generator is more likely to pull from it and name you; if it is not, the model writes its answer from a competitor's page and your click never happens. Making your site quotable by these generators (clear claims, clean structure, entity clarity) is the core of our AI SEO work.
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