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    <h1 style="color:#4c555a; margin-top: 0px;">What is Apache Zeppelin?</h1>
    <p style="margin-bottom: 0px; margin-top: 20px; font-size: 18px; font-style="font-family: "Roboto", sans-serif;">
      Multi-purpose notebook which supports
    </p>
    <p style="font-size: 18px; font-style="font-family: "Roboto", sans-serif;">
      20+ language backends
    </p>
    <ul style="list-style-type: none; padding-left:10px; margin-top: 30px;" >
      <li style="font-weight: 300; font-size:18px; margin: 5px;"><span class="glyphicon glyphicon-import" style="margin-right:10px"></span> Data Ingestion</li>
      <li style="font-weight: 300; font-size:18px; margin: 5px;"><span class="glyphicon glyphicon-eye-open" style="margin-right:10px"></span> Data Discovery</li>
      <li style="font-weight: 300; font-size:18px; margin: 5px;"><span class="glyphicon glyphicon-wrench" style="margin-right:10px"></span> Data Analytics</li>
      <li style="font-weight: 300; font-size:18px; margin: 5px;"><span class="glyphicon glyphicon-dashboard" style="margin-right:10px"></span> Data Visualization & Collaboration</li>
    </ul>
    <br/>
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## Documentation 

#### Quick Start

* [Install](./quickstart/install.html) for basic instructions on installing Apache Zeppelin
* [Explore UI](./quickstart/explore_ui.html): basic components of Apache Zeppelin home
* [Tutorial](./quickstart/tutorial.html)
* [Spark with Zeppelin](./quickstart/spark_with_zeppelin.html)
* [SQL with Zeppelin](./quickstart/sql_with_zeppelin.html)
* [Python with Zeppelin](./quickstart/python_with_zeppelin.html)

#### Usage 
* Dynamic Form 
  * [What is Dynamic Form](./usage/dynamic_form/intro.html): a step by step guide for creating dynamic forms
* Display System 
  * [Text Display (`%text`)](./usage/display_system/basic.html#text)
  * [HTML Display (`%html`)](./usage/display_system/basic.html#html)
  * [Table Display (`%table`)](./usage/display_system/basic.html#table)
  * [Network Display (`%network`)](./usage/display_system/basic.html#network)
  * [Angular Display using Backend API (`%angular`)](./usage/display_system/angular_backend.html)
  * [Angular Display using Frontend API (`%angular`)](./usage/display_system/angular_frontend.html)
* Interpreter  
  * [Overview](./usage/interpreter/overview.html): what is interpreter group? how can you set interpreters in Apache Zeppelin?
  * [User Impersonation](./usage/interpreter/user_impersonation.html) when you want to run interpreter as end user
  * [Interpreter Binding Mode](./usage/interpreter/interpreter_binding_mode.html) when you want to manage separate interpreter contexts 
  * [Dependency Management](./usage/interpreter/dependency_management.html) when you include external libraries to interpreter
  * [Installing Interpreters](./usage/interpreter/installation.html): Install not only community managed interpreters but also 3rd party interpreters
  * [Execution Hooks](./usage/interpreter/execution_hooks.html) to specify additional code to be executed by an interpreter at pre and post-paragraph code execution
* Other Features:
  * [Publishing Paragraphs](./usage/other_features/publishing_paragraphs.html) results into your external website
  * [Personalized Mode](./usage/other_features/personalized_mode.html) 
  * [Customizing Zeppelin Homepage](./usage/other_features/customizing_homepage.html) with one of your notebooks
  * [Notebook actions](./usage/other_features/notebook_actions.html)
  * [Zeppelin-Context](./usage/other_features/zeppelin_context.html)
* REST API: available REST API list in Apache Zeppelin
  * [Interpreter API](./usage/rest_api/interpreter.html)
  * [Zeppelin Server API](./usage/rest_api/zeppelin_server.html)
  * [Notebook API](./usage/rest_api/notebook.html)
  * [Notebook Repository API](./usage/rest_api/notebook_repository.html)
  * [Configuration API](./usage/rest_api/configuration.html)
  * [Credential API](./usage/rest_api/credential.html)
  * [Helium API](./usage/rest_api/helium.html)

#### Setup 
* Basics 
  * [How to Build Zeppelin](./setup/basics/how_to_build.html)
  * [Manage Zeppelin with systemd](./setup/basics/systemd.html)
  * [Multi-user Support](./setup/basics/multi_user_support.html)
* Deployment 
  * [Spark Cluster Mode: Standalone](./setup/deployment/spark_cluster_mode.html#spark-standalone-mode)
  * [Spark Cluster Mode: YARN](./setup/deployment/spark_cluster_mode.html#spark-on-yarn-mode)
  * [Spark Cluster Mode: Mesos](./setup/deployment/spark_cluster_mode.html#spark-on-mesos-mode)
  * [Zeppelin with Flink and Spark Cluster](./setup/deployment/flink_and_spark_cluster.html)
  * [Zeppelin on CDH](./setup/deployment/cdh.html)
  * [Zeppelin on VM: Vagrant](./setup/deployment/virtual_machine.html)
* Security: available security support in Apache Zeppelin
  * [HTTP Basic Auth using NGINX](./setup/security/authentication_nginx.html)
  * [Shiro Authentication](./setup/security/shiro_authentication.html)
  * [Notebook Authorization](./setup/security/notebook_authorization.html)
  * [Data Source Authorization](./setup/security/datasource_authorization.html)
  * [HTTP Security Headers](./setup/security/http_security_headers.html)
* Notebook Storage: a guide about saving notebooks to external storage
  * [Git Storage](./setup/storage/storage.html#notebook-storage-in-local-git-repository)
  * [S3 Storage](./setup/storage/storage.html#notebook-storage-in-s3)
  * [Azure Storage](./setup/storage/storage.html#notebook-storage-in-azure)
  * [Google Cloud Storage](./setup/storage/storage.html#notebook-storage-in-gcs)
  * [ZeppelinHub Storage](./setup/storage/storage.html#notebook-storage-in-zeppelinhub)
  * [MongoDB Storage](./setup/storage/storage.html#notebook-storage-in-mongodb)
* Operation 
  * [Configuration](./setup/operation/configuration.html): lists for Apache Zeppelin
  * [Proxy Setting](./setup/operation/proxy_setting.html)
  * [Upgrading](./setup/operation/upgrading.html): a manual procedure of upgrading Apache Zeppelin version
  * [Trouble Shooting](./setup/operation/trouble_shooting.html)

#### Developer Guide
* Extending Zeppelin
  * [Writing Zeppelin Interpreter](./development/writing_zeppelin_interpreter.html)
  * [Helium: Overview](./development/helium/overview.html)
  * [Helium: Writing Application](./development/helium/writing_application.html)
  * [Helium: Writing Spell](./development/helium/writing_spell.html)
  * [Helium: Writing Visualization: Basic](./development/helium/writing_visualization_basic.html)
  * [Helium: Writing Visualization: Transformation](./development/helium/writing_visualization_transformation.html)
* Contributing to Zeppelin
  * [How to Build Zeppelin](./setup/basics/how_to_build.html)
  * [Useful Developer Tools](./development/contribution/useful_developer_tools.html)
  * [How to Contribute (code)](./development/contribution/how_to_contribute_code.html)
  * [How to Contribute (website)](./development/contribution/how_to_contribute_website.html)

#### Available Interpreters 
  * [Alluxio](./interpreter/alluxio.html)
  * [Beam](./interpreter/beam.html)
  * [BigQuery](./interpreter/bigquery.html)
  * [Cassandra](./interpreter/cassandra.html)
  * [Elasticsearch](./interpreter/elasticsearch.html)
  * [Flink](./interpreter/flink.html)
  * [Geode](./interpreter/geode.html)
  * [Groovy](./interpreter/groovy.html)
  * [HBase](./interpreter/hbase.html)
  * [HDFS](./interpreter/hdfs.html)
  * [Hive](./interpreter/hive.html)
  * [Ignite](./interpreter/ignite.html)
  * [JDBC](./interpreter/jdbc.html)
  * [Kylin](./interpreter/kylin.html)
  * [Lens](./interpreter/lens.html)
  * [Livy](./interpreter/livy.html)
  * [Mahout](./interpreter/mahout.html)
  * [Markdown](./interpreter/markdown.html)
  * [Neo4j](./interpreter/neo4j.html)
  * [Pig](./interpreter/pig.html)
  * [Postgresql, HAWQ](./interpreter/postgresql.html)
  * [Python](./interpreter/python.html)
  * [R](./interpreter/r.html)
  * [SAP](./interpreter/sap.html)
  * [Scalding](./interpreter/scalding.html)
  * [Scio](./interpreter/scio.html)
  * [Shell](./interpreter/shell.html)
  * [Spark](./interpreter/spark.html)
  * [Submarine](./interpreter/submarine.html)

#### External Resources
  * [Mailing List](https://zeppelin.apache.org/community.html)
  * [Apache Zeppelin Wiki](https://cwiki.apache.org/confluence/display/ZEPPELIN/Zeppelin+Home)
  * [Stackoverflow Questions about Zeppelin (tag: `apache-zeppelin`)](http://stackoverflow.com/questions/tagged/apache-zeppelin)