what is nodejs? how nodejs work? what is life cycle of nodejs? Nature of nodejs? difference between synchronus and asynchronous? event loop? callback and promises? Middleware and authorization.

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Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine.

Node.js allows developers to run JavaScript on the server-side.
It uses an event-driven, non-blocking I/O model that makes it lightweight and efficient.
Node.js has a built-in module system and a large ecosystem of third-party modules.
The life cycle of Node.js involves initializing the environment, executing the script, and exiting the process.
Node.js is well-suited for building scalable, real-time applications such as chat apps and streaming services.
Synchronous code blocks execution until a task is completed, while asynchronous code allows other tasks to continue while waiting for a task to complete.
The event loop is a mechanism that allows Node.js to handle multiple requests simultaneously.
Callbacks are functions that are passed as arguments to other functions and are executed when the other function completes.
Promises are objects that represent the eventual completion or failure of an asynchronous operation.
Middleware is a function that sits between the client and server and can modify the request or response.
Authorization is the process of determining whether a user has permission to access a resource.

what is nodejs? how nodejs work? what is life cycle of nodejs? Nature of nodejs? difference between synchronus and asynchronous? event loop? callback and promises? Middleware and authorization.

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