DEV Community: Kuganesh S

What is JRE?

Kuganesh S — Tue, 03 Feb 2026 05:29:02 +0000

JRE:

It stands for Java Runtime Environment which provide an environment to run the bytecode.
It combines with JVM, JIT and core libraries used to run java programs.
It is platform dependent.

What is JDK?

Kuganesh S — Tue, 03 Feb 2026 05:08:05 +0000

JDK:

It stands for Java Development Kit. It is tool which combines JRE(Java Runtime Environment) and JVM(Java Virtual Machine)
It converts java program to bytecode in the format of java,javac,javadoc and so on

What is CSS?

Kuganesh S — Thu, 18 Dec 2025 15:26:21 +0000

CSS stands for Cascading Style Sheet.It is the language we use to style an HTML document.
It is used to describe the look of the webpage.
CSS controls how elements display on the webpage,such as fonts,colors,spacing,responsive sizes.
There are three different CSS types namely known as

1. Inline CSS:
It is directly applied inside the element.
2. Internal CSS:
It is applied using <style>inside the HTML code.
3. External CSS:
It is applied on external file .css.

Difference Between named function and anonymous function in JS?

Kuganesh S — Fri, 21 Nov 2025 07:42:25 +0000

Named function:

A named function has an identifier (name) after the function keyword.
Easy to debug the errors because errors show the function name.
You can call the function before it is defined.
You can call it anywhere in the code for execution and reuse.
It is hoisted.

function add(a, b) {
  return a + b;
}

Anonymous function:

An anonymous function has no name.
Usually it is assigned to a variable or used as a callback function.
hard to debug because stack traces show “anonymous”.
Commonly used with arrow functions (()=>{}).
It is not hoisted.

const add = function(a, b) {
  return a + b;
};

Difference Between Synchronous and Asynchronous in JS?

Kuganesh S — Fri, 21 Nov 2025 07:01:04 +0000

Synchronous:

Synchronous is a line-by-line execution process.
New operation will not run until the previous one is completed.It is a single threaded programming language.
It follows a blocking execution model.
The order of execution is easily predictable.
Long running tasks stop the entire program.
Easy to read and debug due to its sequential order.
Browser user interface may freeze or slow during heavy synchronous tasks.

console.log("Morning");
console.log("Afternoon");
console.log("Night");

Asynchronous:

Asynchronous able to keep running program without waiting for the current task to finish.
It follows a non-blocking execution model.
It uses callbacks, Promises, and async/await.
It is mainly used in API calls,timers and file reading.
Execution order is not always linear.
It improves performance and responsiveness.
In asynchronous, Promises help to avoid callback hell.

console.log("Morning");

setTimeout(() => {
      console.log("Afternoon");
      }, 1000);

console.log("Night");

What are the tags in HTML?

Kuganesh S — Fri, 24 Oct 2025 11:22:23 +0000

There are many tags in HTML,they are known as

Document structure tags
Content and text formatting tags
Form tags
Table tags
Media tags

Document structure tags

<!DOCTYPE html>-It declares the version & document type of HTML.
<html>-It consists of all other HTML elements.
<head>-It contains title,character set & CSS links.Also it not visible in HTML webpage.
<title>-Used to declare title of the HTML webpage.
<body>-It contains content of the HTML webpage like text,images,links and so on.

Content and text formatting tags

<h1>to<h6>-Heading levels used for webpage from high to low.
<p>-It helps to write paragraph content inside the HTML webpage.
<a>-Anchor tag creates hyperlink to another webpage.
<img>-Adding images to webpage.
<ul>-Creates unorder list in the HTML document.
<ol>-Creates order list in the HTML document.
<li>-Uses within the unorder & order list.
<strong>-To bold the text.
<em>-Text to convert italic.
<div>-It is block level container & divison or section in HTML webpage.
<span>-For styling & scripting purposes.
<br>-For break the line.
<hr>-For horizontal line.

Form tags

<form>-It defines user input in HTML.
<input>-Various types of inputs are created like text,password,email,button and son on.
<select>-Dropdown list is created.(ex:<select id="bikes">)
<option>-Create a options within the <select>.
<button>-Create a click button.

Table tags

<table>-It defines the HTML table.
<tr>-It defines the table row element.
<th>-It defines the table header element.
<td>-It defines the table data inside the HTML table.Some other attributes are(<thead>,<tbody>,<tfoot>).

Media tags

<audio>-It defines a sound content like music or spoken audio.

What is HTML?

Kuganesh S — Thu, 23 Oct 2025 06:33:16 +0000

1.HTML stands for Hyper Text Markup Language.
2.It used for creating webpages.
3.It defines the meaning and structure of the web content.
4.HTML consists of Head,Body&Footer.
5.In HTML there are many semantic tags,they are helpful to create and structure the web page.
6.The tag is the container for all other HTML elements.

`<!DOCTYPE html>
<html lang="en">
<head>
    <title>HTML</title>
</head>
<body>

</body>
</html>`