What is extension | Extension meaning

If you are app developer, web developer. If you are a blogger or do any work on computer, you must have heard about the extension. Because the whole computer system is extension based. Even media files are also extension based. About which we will get information through this article. What is Extension?

What is extension

There are many files in computer/mobile etc. Some of which are text, some media files, some computer program files etc. But whatever file you see, you will see a common thing in all. And that same “.” at the end of the name of these files. Along with some words like .mp4, .apk etc., these are called extensions.

The specialty of the extension is that, at the end of the file, the extension of that file is there, no matter what type of file it is.

And yes, the extension of any file type is not the same. For example, suppose that an image has many extensions. And some of the most commonly used extensions are jpg, jpeg, png. Although there are many other extensions of the image file. These are some of the extensions that are used the most.

And the quality and size of the images of all Extensions are different. It is not only in images but all other types of files have different types of extensions.

In the same way, there are files of video, audio, texts etc. Let us know about the extensions of some different files.

But before that, know that no matter what kind of file it is, all files have extensions. Yes but if we talk about normal folders then they do not have any extensions. Because normal folders do not contain any kind of content. Rather folders contain other folders and files.

By the way, the amount of extension is very high because as far as it is concerned. The extensions of media files are quite limited. And only a few of which are such extensions. Whose formats are used more.

As it is the most used file format for audio. The most commonly used file format for .mp3, video is .mp4. jpg, jpeg, png are all widely used for images.

And the series of extensions does not end here. Because we have told you above that the entire computer system is extension based. Even apps, softwares, websites, programming files etc. There are also extensions, although only developers have an idea about them. Because they need all these things more.

What is text extension

If you create a file by computer ms word, wordpad. So that document would be a text document for which .txt extension is used.


You must have installed/uninstalled and used many apps. But perhaps you would not know that the app also has a file extension. There are many files and media files etc. in the app. That is, different types of extension files are used to make an app. And all those files are kept together in the android application package. Like whatsapp.apk, but normally you will not get to see this Extension .apk. But if you download the app from an external site. Then you will get to see apk extension.

Computer Software

Various types of files are also required to make computer software. And those files are kept together by .exe extension. When you download any software, it will be with .exe extension.


Different types of extensions are used by websites such as .com, .in, .edu etc. But all extensions of the website perform a similar function. And their extensions target a particular topic.

How many extensions are there in total

There are many extensions available for different types of tasks/files, such as

  • .AIF
  • .bin
  • .AVI
  • .vcd
  • .CLASS
  • .db
  • DOCX
  • .mid
  • .EPS
  • .GIF
  • .Which
  • .CSV
  • .rpm
  • .PDF
  • .PY
  • .pkg
  • .RTF
  • .xhtml
  • .rar
  • .WAV
  • .log
  • .ZIP
  • .md
  • .XLS
  • .aif 
  • .xml
  • .wsf
  • .fon
  • .ttf
  • .svg
  • .asp
  • .css
  • .jsp
  • .php
  • .rss
  • .ppt
  • .key
  • .swift
  • .cpp

And so on

We have given you a lot of information about the extension above. But if you still have confusion about extension then this step will clear your doubt. Let us create an extension.

By the way, you can create any file extension using any notepad. But all the files created by this process will not work. Rather only a few files will work which do not require any other program/data. Like .html .txt file extension etc.

So first of all open your notepad and if you are a mobile user. Even then you can create these files, but for this you will need a code editor app.

So open your notepad and write something normally there, and save the file by pressing ctrl + S. And while saving add “.txt” extension at the end of the file name. Like suppose you want to save that file with example name. So while saving you have to type name like example.txt.

Now due to this extension a txt file of those texts will be created which contains the texts. However, if you use wordpad or ms word, then automatically while saving, the same text of that text becomes a txt file. But only txt extension is created from it. But any kind of extension can be created through notepad.

Now we will tell you about .html extension , after which there will be no doubt in your mind.

So the first step for this is, get a little knowledge about html and some of their example codes will also be found.

Open notepade, write html code. Some codes will be found in the above link, if you want, you can search google for more codes. Save the html codes by writing/pasting them in notepad. And while saving, put .html at the end of the file name and save it like example.html.

After saving the file, open it in the browser, and that file will work exactly like a web page. And remember that if you make any mistake in the html code, then error can occur in it, the code with error will not work.

In the same way, through notepad, you can create a file of any extension. Like suppose you wrote something on notepad and if you want it to be .html. Can save in Extensions like .txt, .mp4, .mp3, .apk etc. And notepad will create it in a file of the same extension but all types of extensions will not work when created with notepad.

Rather, only those extensions will work which contain text or code. But even among these types of files, all types of files will not work normally. Because the process of running different types of file extensions is different.

And if you create files other than text files i.e. .html, .txt etc. For example, media file extension will not work. Because graphics are most important for media files. And media file extension can be created only by compatible devices for that. Like from camera or from any app.

What is extension in computer

Whether it is mobile or computer or tablet, any device, the extension works in the same way on all devices. The only condition is that which extensions the device supports. You can understand by example. That .apk is the extension of Android application which will not work on computer. Similarly, there are many computer program extensions which mobiles do not support. But most of the extensions are such that are supported by all mobile computers. Such as media file extension, texting etc.

In this article you learned what is extension and extension meaning. We hope this information will prove useful for you.