HTML (HyperText Markup Language) and CSS (Cascading Style Sheets) are two fundamental technologies used to create and design web pages.

1. HTML (HyperText Markup Language):

• HTML is the standard markup language for creating web pages.
• It provides the structure of a web page by using a system of elements and tags to define different parts of content like headings, paragraphs, lists, links, images, etc.
• HTML elements are represented by tags enclosed in angle brackets (<tag>), with content between the opening and closing tags.
• Example: <p>This is a paragraph.</p>, <h1>This is a heading</h1>, <img src="image.jpg" alt="Image description">.

1. CSS (Cascading Style Sheets):

• CSS is a style sheet language used for describing the presentation of a document written in HTML.
• It allows you to control the appearance of HTML elements by defining styles such as colors, fonts, layouts, and more.
• CSS works by targeting HTML elements and applying styling rules to them.
• CSS rules consist of a selector (which targets the HTML element) and one or more declarations (which define the style properties and their values).
• Example: p { color: blue; font-size: 16px; } In this example, p is the selector targeting all <p> elements, and the declarations inside the curly braces define that paragraphs should have blue color text and a font size of 16 pixels.

Together, HTML and CSS form the basic building blocks of web pages. HTML provides the structure and content of a webpage, while CSS provides the styling and presentation. They often work together, with HTML defining the elements and CSS controlling how those elements are displayed.