Middleware, Role based authentication, Cluster, scaling, design pattern, Javascript ES6, async-await, promise etc

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1. Middleware: Middleware is software that acts as a bridge or mediator between several applications or components. Middleware is frequently used in web development to perform activities such as request/response processing, authentication, logging, and others. It's frequently used in Node.js frameworks like Express.js.

2. Role-Depending Authentication: A security technique that enables access to specified resources or features based on a user's role or permissions is known as role-based authentication. It is frequently used in applications to restrict who may do what within the system.

3. Cluster: A cluster is a set of networked computers or servers that work together to execute tasks in the context of software. Clusters can provide high availability, load balancing, and increased application performance.

4. Scaling is the process of modifying an application's resources (such as servers, databases, or infrastructure) to meet growing traffic or demand. Vertical scaling (adding extra resources to a single server) and horizontal scaling are the two basic forms of scalability (adding more servers to a system).

5. A design pattern is a reusable solution to a common problem in software design. They encourage best practises in software development and give an organised approach to issue solving. Patterns such as Singleton, Factory, and Observer are examples.

6. ES6 (ECMAScript 2015) is a significant improvement to the JavaScript language. It added numerous new features and improvements to JavaScript, such as arrow functions, classes, let/const for variable declarations, template literals, and more, making it more powerful and expressive.

7. Async-Await: Async-await is an ES6 feature for managing asynchronous actions in a more synchronous manner. By employing the async and await keywords, developers may create asynchronous code in a more legible and structured manner.

8. Promise: In JavaScript, promises are used to handle asynchronous operations. They reflect a value that is not currently accessible but will be resolved in the future. To manage the successful or failing results of asynchronous actions, promises offer methods like then() and catch().

Middleware, Role based authentication, Cluster, scaling, design pattern, Javascript ES6, async-await, promise etc

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