Easy to learn and use
JavaScript syntax is formed from the Java programming language and is easy to learn in order to write code. Developers use JavaScript in almost every website and mobile app to create client-side scripts. Node.js has also gained significant popularity in the last decade for backend coding. Many major streaming and video platforms have been developed on Node.js.

Platform Independence
Unlike other programming languages, JavaScript can be embedded into any web page and used with many other web development mechanisms and languages. By writing something in it, you can run JavaScript code on any machine. In this way, JavaScript makes application development platform-independent.

Reducing the load on the server
You can use JavaScript to reduce server load and network congestion because it can perform logical operations and do most of the server work on the client side. For example, consider the process of filling out a registration form. The JavaScript quickly checks to see if you entered a 10-digit number for the cell phone field. If these requests were sent to the server, your page would reload with every error, making the registration process very slow and tedious.

Improving the user interface
JavaScript creates websites that make it easy to find and process complex information. Developers use JavaScript to enhance functionality and readability, and to improve user interaction with the site.

Support for Parallelism
JavaScript can execute several different sets of instructions in parallel. On a server, Node.js can handle multiple responses to server requests while needing less bandwidth.

What limitations are relevant to JavaScript?
Programming languages use variables as placeholders for actual data values. For example, in a block of code, a developer might write x=5 and y=x+1. When the code is run, the computer will automatically change x and y to 5 and 6, respectively, to perform functions on them. Data can be of different types, such as a string of text, a number, or a date. This is why most programming languages allow you to define the type of a variable. Once you define a variable type, it doesn’t change; you can’t store numbers in string variables.

For example, if you tell a program that x and y are numbers, and then perform the x+y operation, the computer will know to get two numbers and add them up. On the other hand, if you define x and y as strings, the + operator will add the two strings together to create a longer word.