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navigation_title: "Types and fields"
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# Types and special fields in {{esql}}

This section details how {{esql}} handles different data types and special fields.

* [Implicit casting](esql-implicit-casting.md): Understand how {{esql}} automatically converts between data types in expressions.

* [Time spans](esql-time-spans.md): Learn how to work with time intervals in {{esql}}.

* [Metadata fields](esql-metadata-fields.md): Learn about the metadata fields supported by {{esql}}, including `_index` and `_score`.

* [Multivalued fields](esql-multivalued-fields.md): Learn how to work with fields that contain multiple values in {{esql}}.