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HTML stands for Hyper Text Markup Language. HTML is not a programming language, but rather a markup language, which means the code is a markup of how the data within the code should be structured, laid out, or formatted. HTML coding is typically written in paired tags (<></>) called start tags (<>) and end tags (</>) (or opening tags and closing tags).
Not all tags have start and end tags. Some tags are considered empty tags meaning that they stand alone and are not marking up data. Some tags can have attributes added to them in order to accomplish formatting such as aligning, colors, or borders.
HTML tags themselves are not case sensitive, but note that URL addresses, files and image names, and other outside references may be case sensitive. The World Wide Web Consortium (W3C) suggests using all lowercase. Regardless, be consistent.
A web page created with the most basic HTML:
<h1> Example Heading </h1>
<p> Here is an example paragraph. </p>