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# Table Engines
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The table engine (type of table) determines:
- How and where data is stored: where to write it to, and where to read it from.
- Which queries are supported, and how.
- Concurrent data access.
- Use of indexes, if present.
- Whether multithreaded request execution is possible.
- Data replication.
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When reading data, the engine is only required to extract the necessary set of columns. However, in some cases, the query may be partially processed inside the table engine.
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Note that for most serious tasks, you should use engines from the `MergeTree` family.