> For the complete documentation index, see [llms.txt](https://docs.search.io/documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.search.io/documentation/fundamentals/search-settings.md).

# Search settings

Relevance is a measurement of how well a document matches a query. To determine which documents are most relevant for a given search query, Search.io leverages a hybrid search engine that combined traditional keyword matching with semantic search through our Neuralsearch™ engine. Combined with machine learning algorithms, Search.io does not only takes into account the frequency with which the search terms appear in documents, but also user behaviour and business data to achieve the most relevant results.

To fine-tune relevance and ranking, Search.io offers a number of easy to use settings combined with a realtime search preview.

{% content-ref url="/pages/KFfP1MDOliyc3RGn9yPF" %}
[Understanding relevance and ranking](/documentation/fundamentals/search-settings/understanding-relevance-and-ranking.md)
{% endcontent-ref %}

{% content-ref url="/pages/F654qUlittxw1Y3cYpxT" %}
[Textual relevance](/documentation/fundamentals/search-settings/textual-relevance.md)
{% endcontent-ref %}

{% content-ref url="/pages/iLpyBZnjvTx2vPtD4j2n" %}
[Ranking adjustments](/documentation/fundamentals/search-settings/ranking-adjustments.md)
{% endcontent-ref %}

{% content-ref url="/pages/wiVo9c9a6C6ZrBRqSguh" %}
[Dynamic boosting](/documentation/fundamentals/search-settings/dynamic-boosting.md)
{% endcontent-ref %}

{% content-ref url="/pages/vkcjoOwDvt7MlVScyw2r" %}
[Synonyms](/documentation/fundamentals/search-settings/synonyms.md)
{% endcontent-ref %}

{% content-ref url="/pages/5xvcyK7cocLBVdGehyLU" %}
[Redirects](/documentation/fundamentals/search-settings/redirects.md)
{% endcontent-ref %}