In one sentence
A Citation is when a generative AI references a web page, company, or piece of data as its "source" (i.e., as evidence) while producing an answer. It is one of the most important metrics in GEO.
What does it look like in practice?
For example, when you ask Perplexity "What's the market size of B2B SaaS?", you might get something like:
The domestic B2B SaaS market is forecast to keep expanding (Sources: ○○ Research Report, △△ Industry Journal).
Here, research firms and industry media are cited as the basis for the answer.
The goal of GEO is to become the side that gets cited.
Another example: if your own site gets cited when someone asks ChatGPT "What are some highly-rated yoga studios in Tokyo?", that is also a Citation.
Why it matters
- Citation = consideration set: Companies that don't appear in AI answers won't enter the user's consideration set
- More citations means higher perceived credibility: AIs tend to cite authoritative sources repeatedly
- Effects compound: Once cited, the probability of being cited again next time rises
Citation metrics (observation examples in GEO Meter)
| Metric | Meaning |
|---|---|
| Citation count | How many times you were cited within a month |
| Citation context | What kind of question you were cited in (positive / neutral / negative) |
| Citation position | Whether at the beginning or end of the answer (earlier = greater impact) |
| SOV | Your share within the same theme (see below) |
Differences in citation behavior by AI
| AI | Citation style | Ease of observation |
|---|---|---|
| Perplexity | URLs explicitly cited | Excellent (easy to capture automatically) |
| Gemini AI Overview | URLs explicit (but redirected) | Good (redirect resolution required) |
| ChatGPT | Mentions source names in body text | Moderate (NLP extraction required) |
| Claude | Mentions source names in body text | Moderate (same as above) |
GEO Meter observes all of these in a unified way and visualizes them through metrics like SOV (Share of Voice).