HTML elements are the fundamental building blocks of a webpage. They are used to create the structure and content of a webpage, and are represented by tags that are enclosed in angle brackets. The tags indicate the type of element and its purpose, and often include attributes that provide additional information about the element.
Some common examples of HTML elements include headings (h1, h2, h3), which are used to organize and structure the content of a webpage by indicating the hierarchy of importance for different sections. Paragraphs (p) are used to create blocks of text, images (img) can be used to display pictures or other visual content, and links (a) can be used to create hyperlinks to other pages or resources.

HTML elements can also be used to create lists, such as unordered lists (ul) and ordered lists (ol), which are used to organize and present information in a clear and structured way. List items (li) are used to create individual items within a list.
Forms (form) are used to allow users to interact with a webpage by submitting information, such as text input (input), select (select) and textarea elements. These elements can be used to create different types of form controls, such as text fields, drop-down menus, and text areas, that allow users to enter and submit information.
Divs (div) are used to create a block-level container for elements, which can be used to group elements together and apply styles to them as a group.
In addition to these basic elements, there are many other types of HTML elements that can be used to create a wide variety of content and effects on a webpage. Some examples include tables (table, tr, td) for displaying data in a tabular format, buttons (button) for creating interactive controls, and video (video) and audio (audio) elements for displaying multimedia content.
All of these elements are used in combination to create a webpage, and they can be nested inside one another to create a hierarchical structure. The browser uses the structure of the HTML elements to render the webpage visually, and the CSS is used to add style and layout to the elements.
It’s also worth noting that HTML5 introduced new elements to create semantic meaning to web pages. These elements include section, article, nav, aside, header and footer, that make it easier for browsers to understand the content and context of the page. They also make it easier for search engines to understand the content of the page, and in turn, improve the SEO.
In conclusion, HTML elements are the fundamental building blocks of a webpage. They are used to create the structure and content of a webpage, and are represented by tags that are enclosed in angle brackets. The variety of HTML elements available allows for the creation of a wide range of content and effects on a webpage, and they can be nested inside one another to create a hierarchical structure. Understanding HTML elements and how they work is essential for anyone who wants to create or modify webpages.