# Components

Some of the standard grammar files contain components, which extract attributes from matched phrases, such as topic, subject, and positive or negative sentiments. These attributes are called components because they are the components of a single match.

For example, if you use sentiment analysis to match the phrase Their service is fantastic as conveying positive sentiment, you can then use components to identify service as the subject matter, and fantastic as the adjective that describes the subject (note that the sentiment is not necessarily an adjective in all cases).

You can also set up components when you write your own custom grammar files.

For more information on how to configure and define components in your grammar files, and when to use them, see Components.

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