Buffer
The Buffer class provides an efficient way to handle binary data.
Binary data is often called "raw data", because it's exactly that - arbitrary sequences of bytes. Unlike strings, which are immutable and internally represented in different ways, binary data is fundamentally just a mutable sequence of numbers.
Buffer is a global constructor in Node.js, meaning you don't need to require it.
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Creating a Buffer
The static Buffer.from method is used to create a new Buffer from existing data. It is a safe and common way to work with binary data in Node.js.
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Allocate a Buffer
The Buffer.alloc method creates an empty Buffer of the given size.
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