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JSON is widely accepted text formatted structured data. JSON stands for " JavaScript Object Notation ". In general JSON can represent 1. Object of database record. 2. Object to represent a list of HTML elements. 3. Result of search query. 4. Response of an Ajax call. Here you can see JSON is used in many different areas and for many different scenarios. This means it has simple data structure. most of programming languages adopt it and it can flow easily from one connection to another. You can find JSON office definition here JSON Official Site . JSON is represented by two structural types, which includes two primitive types. Structural types Array : A sequential list of primitive data types between square brackets [ ] Object : Collection of key, value pair stored inside curly braces { }, where value would be primitive data type Primitive types : There are two primitive types key and value. " key " should be string and " value (data type)

Elasticsearch is open source search system based of Apache Lucene. this is a brief introduction, you can find more information on Elasticsearch Official Site or   Wiki . What are features of Elasticsearch? Here are list of features of Elasticsearch. Real Time Search and Analytic . Distributed Data (Scales Horizontally)  Based on Apache Lucene High Availability Full Text Search JSON Based Documents RESTful API Multi Facets Geo Location Search Open Source How to install ElasticSearch? Download the latest version from elasticsearch.org/download . Then unzip it or use following command in console to download Elasticsearch. curl -L -O http://download.elasticsearch.org/PATH/TO/LATEST/$VERSION.zip unzip elasticsearch-$VERSION.zip cd elasticsearch-$VERSION Now move to unzip folder and run following command {elasticsearch unzip folder path}/bin/elasticsearch It will start Elasticsearch How to use ElasticSearch? To interactive with data usi