Streams are objects that let you read data from a source or write data to a destination in a continuous fashion. In Node.js, there are four types of streams −

• Readable − Stream which is used for a read operation.

• Writable − Stream which is used for a write operation.

• Duplex − Stream which can be used for both reading and write operation.

• Transform − A type of duplex stream where the output is computed based on input.

Each type of Stream is an EventEmitter instance and throws several events at a different instance of times. For example, some of the commonly used events are −

• data − This event is fired when there is data is available to read.

• end − This event is fired when there is no more data to read.

• error − This event is fired when there is an error receiving or writing data.

• finish − This event is fired when all the data has been flushed to the underlying system

Streaming means listening to music or watching a video in ‘real-time’, instead of downloading a file to your computer and watching it later

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