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# Filter Engine

A Filter engine filters a track to return only records that meet specified conditions. This section describes the parameters that you can set in the configuration section for a Filter ESP task.

Configuration Parameter | Description
--- | ---
Input | The track to filter.
LuaScript | A Lua script that defines conditions that a record must meet in order to be included in the output track.
RequiredString | A string that a record must contain in order to be included in the output track.
RequiredSubstring | A substring that a record must contain in order to be included in the output track.
Type | The type of ESP engine to use. Set this parameter to `filter`.

## Output Tracks

This engine produces a single output track, named `TaskName.Output`. The output track has the same format as the input track.

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