What is JavaScript, Uses, Advantages and Disadvantages of it?


JavaScript: If you have an interest in web designing then you must have heard the name of the JavaScript, you also know what is JavaScript and you may have used it too.

Do you want to be a web designer? Then, you should learn JavaScript with HTML and CSS, because JavaScript is very useful for any type of website.

Today, in this article, you will know what is JavaScript, how can it benefit from learning, what is the purpose of the website and what can be done with it.

What is JavaScript


  • JavaScript is a powerful scripting language that can be added with HTML to make the webpage more interactive.
  • It was created by Brendan Eich in Netscape in 1995, then its name was Live script, which was later changed to JavaScript.
  • JavaScript is client-side scripting, which means it runs on the user’s browser.
  • Whenever the user sends a request for a webpage, then the server also sends the JavaScript code along with the HTML of that page to the browser, now the responsibility of this browser is that it executes the code of that JavaScript as needed.
  • You can see the JavaScript code on your browser because it runs on the browser.
  • On the contrary, you might have heard about server-side programming such as PHP, ASP.Net, JSP etc. All of these languages are created on the program browser but not run on the server and its output is converted to HTML and appears in the browser and its code You cannot see on the browser.

What is the difference between JavaScript, HTML, and CSS?

Many people live in quite a confusion before learning about JavaScript and there are some questions in their mind such as:

  • What is the difference between JavaScript, HTML, and CSS?
  • Cannot we create a website without JavaScript?
  • Do we have to learn these three?

All these questions can be answered only when we know what is the work of these three people. So let’s understand the use of these three:

HTML: This is the structure of the web page.

CSS: Cascading Style Sheets is designed with part of the website’s presentation, and the color is filled in it.

JavaScript: Page is created interactive, some logic like user click on a button, which function will execute and which task will be done etc.

All this means that you can create a website from HTML and CSS, but if you want to add some interactive features to it, then you have to use JavaScript in this way.

What are the uses of JavaScript?


It is used to create an interactive website. Some uses of JavaScript are given below:

  1. Form Validation: While taking input on a form by the user, verify that the data entered like email, mobile no etc. is in the correct format or not.
  2. Popup Windows: such as alert dialog box, confirm dialog box etc. can also be created from JavaScript.
  3. Drop Down Menu: The dynamic drops down menu can be created for the website.
  4. Image Slider: You can also create an image slider with the help of JavaScript to make the website beautiful.
  5. Animation: It is also used to animate the elements of the website and to put different animation effects.
  6. Autocomplete: You must have seen on Google, when we type something in the text box, suggestions start coming down. This type of things you can make from JavaScript.
  7. Browser Detection: User can find out what the browser is using.
  8. Cookies: Some information may be stored in the user’s browser and when the user visits again, this information is called cookies.

Which tools are needed for JavaScript?

To coding JavaScript and running it does not require any special tools, only two things should be in your system:

  1. Code Editor: You can use a normal text editor to write code like notepad or any code editor such as Notepad, Dreamweaver, Sublime, Brackets etc. can use anyone.
  2. Browser: You can use an advanced web browser such as Chrome, Firefox, Safari etc.

Benefits of JavaScript

  1. Very Fast: JavaScript is very fast because of being a client side. Because it does not include time waste in connecting to the server. JavaScript is executed without connecting to the server.
  2. Cross Platform: JavaScript runs smoothly on any browser and operating systems without any problems. All the latest browsers support JavaScript by default.
  3. Works with Multiple Languages: JavaScript can work easily with other languages. Such as HTML, CSS, and PHP etc.
  4. Simple: JavaScript is a very simple language. Anyone can easily learn and implement it.

JavaScript Disadvantages

  1. Security Issues: As you know it is executable on the client’s browser, it is not very secure, although keeping some security in view of security, some restrictions have been placed in the user’s system such as it does not read or write the files of the user’s system. Can do it Despite these restrictions, some malicious codes may still run.
  2. JavaScript rendering varies: This can work differently on different browsers i.e. its outputs are not consistent on platforms yet.

Today you read in this article what is JavaScript, what are its work, and hopefully, you will find some basic information about it. Please tell us how was the article about what is JavaScript and benefits of using JavaScript. Give your valuable feedback via comment. Thank You!!



Please enter your comment!
Please enter your name here