Introduction:
The code for a web page is written using Hypertext Markup Language (HTML). HTML is a markup language that allows the creation and structuring of content on a web page. It provides the basic structure and elements necessary for displaying information on the internet.

Explanation:
HTML is the standard language used for building web pages. It uses a set of tags to define the structure and elements of a page. These tags are enclosed in angle brackets and are used to define headings, paragraphs, images, links, and other elements.

Key Pointers:
1. HTML stands for Hypertext Markup Language.
2. It is used to create the structure and content of a web page.
3. HTML tags are used to define elements such as headings, paragraphs, lists, tables, images, links, etc.
4. The basic structure of an HTML document includes the , , and tags.
5. The tag is used to define the root element of an HTML page.
6. The tag contains meta-information about the HTML document, such as the title, character encoding, etc.
7. The tag contains the visible content of the web page.
8. HTML tags can have attributes that provide additional information or modify the behavior of an element.
9. CSS (Cascading Style Sheets) can be used to style and format HTML elements.
10. HTML is a markup language, not a programming language. It defines the structure and presentation of content but does not have the capability of performing complex calculations or logical operations.

Conclusion:
In conclusion, HTML is the language used for writing the code of a web page. It provides the necessary structure and elements to display content on the internet. HTML tags define the structure and formatting of the content, and CSS can be used to style and format the elements. Understanding HTML is essential for creating and designing web pages.