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## 20.1. Deployment Scenarios

Neo4j can be embedded into your application, run as a standalone server or deployed on several machines to provide high availability.

Neo4j deployment options

| Single Instance | Multiple Instances
--- | --- | ---
Embedded | EmbeddedGraphDatabase | HighlyAvailableGraphDatabase
Standalone | Neo4j Server | Neo4j Server high availability mode

### 20.1.1. Server

Neo4j is normally accessed as a standalone server, either directly through a REST interface or through a language-specific driver. More information about Neo4j server is found in Chapter 17, Neo4j Server. For running the server and embedded installations in high availability mode, see Chapter 22, High Availability.

### 20.1.2. Embedded

Neo4j can be embedded directly in a server application by including the appropriate Java libraries. When programming, you can refer to the `GraphDatabaseService` API. To switch from a single instance to multiple highly available instances, simply switch from the concrete `EmbeddedGraphDatabase` to the `HighlyAvailableGraphDatabase`.

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