---
title: "Node Services"
description: "Explore integrated content services for nodes with features like narration, transcription, and image recognition. (Gitana 4.0)"
product: "Gitana"
version: "4.0"
url: "/documentation/gitana/4.0/engine/services/overview"
---

# Node Services

This page organizes articles that describe integrated content services that may operate on your nodes based on the rules, actions, features and content policies applied on your branch.

Each service processes a source property or attachment of a content instance and stores the result back onto that content instance. Each service has its own list of providers.

## Text and Audio

- [Narration](/documentation/gitana/4.0/engine/services/narration.md) converts the textual value of a source attachment or property to audio using text-to-speech.
- [Transcription](/documentation/gitana/4.0/engine/services/transcription.md) converts an audio source attachment to a text file that contains the transcription of the language detected in the source.
- [Text Analysis](/documentation/gitana/4.0/engine/services/text-analysis.md) detects meaning in attached text, such as its sentiment and key phrases.

## Images and Documents

- [Optical Character Recognition](/documentation/gitana/4.0/engine/services/ocr.md) analyzes binary content, such as scanned documents with printed or handwritten elements, to detect characters, words and meaning.
- [Recognition](/documentation/gitana/4.0/engine/services/recognition.md) detects elements such as faces and celebrities in an attached image.