Instruction: Describe what streams are in Node.js and their types.
Context: This question is aimed at understanding the candidate's knowledge of streams in Node.js, which are objects that facilitate reading from and writing to data sources in a continuous manner.
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Streams in Node.js can be broadly classified into four main types: Readable, Writable, Duplex, and Transform streams.
Readable streams are streams from which data can be read, for example, reading data from a file or an HTTP response. These streams effectively allow us to consume data in chunks as it becomes available, rather than waiting for the entire resource to be loaded into memory before processing it. This is akin to drinking through a straw; you consume the drink bit by bit until it's finished....