> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-fix-nav-issues.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# General questions about ClickHouse

> Index page listing general questions about ClickHouse

* [What is ClickHouse?](/get-started/about/intro)
* [Why is ClickHouse so fast?](/get-started/about/why-clickhouse-is-so-fast)
* [Who is using ClickHouse?](/resources/support-center/knowledge-base/general-faqs/who-is-using-clickhouse)
* [What does "ClickHouse" mean?](/resources/support-center/knowledge-base/general-faqs/dbms-naming)
* [What does "Не тормозит" mean?](/resources/support-center/knowledge-base/general-faqs/ne-tormozit)
* [What is OLAP?](/resources/support-center/knowledge-base/general-faqs/olap)
* [What is a columnar database?](/es/resources/support-center/knowledge-base/general-faqs/columnar-database)
* [How do I choose a primary key?](/guides/clickhouse/data-modelling/sparse-primary-indexes)
* [Why not use something like MapReduce?](/resources/support-center/knowledge-base/general-faqs/mapreduce)
* [How do I contribute code to ClickHouse?](/resources/support-center/knowledge-base/general-faqs/how-do-i-contribute-code-to-clickhouse)

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  Check out our [Knowledge Base](/resources/support-center/home) and also browse the many helpful articles found here in the documentation.
</Info>