It stands for Hyper Text Markup Language. It is a language of World Wide Web. It is a standard text information language that is employed to form and show pages on the Web page.

No. There are few HTML tags that don’t need a closing tag. For example:  tag,

tag.

There are several common lists which are used to design a page.
You can opt any or a combination of the following list types:

• Ordered list
• Unordered list
• Menu list
• Directory list
• Definition list

HTML5 has made several steps forward compared to its previous versions. Notable changes include:

• HTML5 supports video, graphics, and audio, whereas HTML only supports them through third-party extensions
• HTML5 is mobile-friendly, whereas HTML is not
• HTML5 is compatible with all major web browsers, whereas HTML is not
• HTML5 offers several options for local storage, whereas HTML only offers cookies
• HTML5 supports multi-threading, whereas HTML operates only in one thread

The most important HTML5 structure elements are:

• <header>, containing the header or top of the page
• <footer>, containing the footer or bottom of the page
• <section>, containing one section that is thematically similar to other sections
• <article>, containing standalone content
• <nav>, containing the navigation functionality of the page
• <aside>, containing secondary content

Formatting tags allow text to be stylized in HTML5 without the need for CSS. There are a number of HTML5 formatting tags, and the most popular ones include:

• <b> - used to make text bold
• <i> - used to italicize text
• <u> - used to underline text
• <mark> - used to highlight text
• <strong> - used to mark text as important

Unlike previous versions, HTML5 offers inbuilt graphics features. The two types of graphics supported by HTML5 are:

• SVG (Scalable Vector Graphics), used to create vector-based graphics, such as diagrams and icons
• Canvas, used to draw graphics, such as shapes

The <header> tag is used to design the header of a web page and can contain a range of elements including text, logos, or a navigation bar. 

The <h1> tag is the textual part of the header and is used to specify the most important section of a piece of content. It’s often used alongside other header tags (through to <h6>) to format and prioritize content sections.

HTML5 introduces several new input types to create a more interactive user experience. The new input types include:

• Date, used to select a date from a drop-down calendar
• Time, used to enter a time
• Email, used to enter an email address
• Tel, used to enter a telephone number with a specific pattern
• Color, used to select a color from a color picker
• Range, used to select a range of values on a slider

Image maps are images with several clickable areas that link to different web pages. They use the <map> and <area> tags. Coordinates are specified to segment the image into different areas and then relevant links are applied.