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Summary - Computer science

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This notes will ensure you that you will understand all the basics of CS as an 12 grade student. This note will cover all your basics to the adavnced level. Hope this helps you all !!

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INTRODUCTION TO HTML
 WHAT IS HTML
HTML stands for HyperText Markup Language. Its primary purpose is to create web pages.
While a single document is called a web page, a website is defined as a collection of multiple
interconnected web pages.
 Requirements for Accessing Websites
To visit a website (such as wikipedia.org), three essential components are required:

1. Hardware: A device like a laptop, PC, or smartphone.
2. Internet Connection: An active connection via mobile data, Wi-Fi, or a
router.
3. Web Browser: Software used to access the internet, such as Google
Chrome, Mozilla Firefox, or Internet Explorer. It is noted that even
when using a "Google app" on a mobile device, a web browser is often
functioning in the background to render the content.

 How the Web Works

 Web Servers: All websites in the world are stored on web servers,
which are powerful computers dedicated to hosting site files.
 The Request Process: When you enter a URL (Uniform Resource
Locator)—the specific address of a website—into the browser's address
bar, your device connects to the web server.
 Downloading Content: Once connected, the server sends the HTML files
to your device. Your browser then downloads and displays these files
as a visual web page.


 Creating vs. Publishing

 Local Creation: You can write and create HTML pages and websites
offline on your computer or mobile without an internet connection.
 Publishing/Hosting: To make your website visible to others globally,
you must upload it to a web server. This process often involves services
like GoDaddy, which provide space on a server for a fee, though some
free hosting options exist.


 The Meaning of HTML
The name is broken down into three core concepts within the sources:

 HyperText: Unlike "normal" or "ordinary" text, HyperText refers to text
that has extra features or effects added to it, such as being bold or
italicized.
 Markup: This refers to the process or method used to convert normal
text into HyperText by adding those extra features.
 Language: It is considered a language because it involves writing code
that a web browser interprets. The browser’s job is to take the source
code and convert it into a format (text, images, etc.) that humans can
easily read and understand.

, HTML is specifically described as a document-oriented language because its primary purpose
is to create documents (web pages), much like how a newspaper page is a type of document.
 Advantages of HTML
The sources highlight several reasons why HTML is widely used:

 No Special Software Required: You do not need complex software to
write HTML. A simple text editor like Notepad (which comes free with
Windows) is sufficient.
 Hardware Independent: HTML programs can run on any operating
system (Windows, Linux, etc.) and any device (laptop, mobile)
regardless of the manufacturer.
 Easy Error Finding: Since HTML code is relatively straightforward and
used for visual layout, finding and fixing errors is much simpler than in
languages like C++.
 Free of Cost: There is no need to purchase HTML or its basic editors;
they are readily available and do not require expensive updates.
 Simple to Learn: It is considered one of the simplest languages to learn,
making it very accessible for students compared to more complex
programming languages.


 Disadvantages of HTML
Despite its strengths, HTML has significant limitations:

 Not a "True" Programming Language: In a strict sense, HTML is for
document creation, not for building standalone software applications
like those created with C++ or Java.
 No Calculations: HTML cannot perform mathematical calculations (like
adding two numbers). To do this, it must be integrated with other
languages like JavaScript or VBScript.
 Static Content: On its own, HTML cannot display dynamic information
such as the current date or time.
 Lack of Interactivity: Standard HTML cannot create interactive web
pages that communicate back and forth with the user; this "two-way
communication" requires additional scripting languages.
 Not an Application: A web page created solely with HTML is a
document, not a functional application that can run independently of a
browser.


 The Concept of Tags
In HTML, a tag is considered the unit of markup. It is the tool used to add features like bolding
or italics to ordinary text.

 Format: Tags are always written inside angle brackets (e.g., <html>).
 Pairs: Most tags come in pairs: an opening tag and a closing tag.
 Closing: A tag is closed by using a forward slash (/) before the tag
name (e.g., </html>).



 The Essential Structure of an HTML Document
To create a standard web page, four essential tags must be used in a specific order. This is
known as the Basic Structure:

Información del documento

Año escolar
1
Subido en
22 de marzo de 2026
Número de páginas
11
Escrito en
2025/2026
Tipo
Resumen
$10.99

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