The Big Tag & Sizing
The <big> tag was part of the original HTML specification intended to manipulate text size directly. It renders text one font size larger than the surrounding content.
Why use it? (Historically)
Before CSS was robust, developers needed quick ways to emphasize text visually without implying semantic importance (like <strong> or <h1>). The big tag was a purely presentational tool.
HTML5 Deprecation
In HTML5, this tag is non-conforming. This means it is obsolete and strictly discouraged. Modern web design separates content (HTML) from presentation (CSS).
The Alternative
Instead of <big>, use the CSS property font-size. For example: style="font-size: larger;" achieves the exact same effect but adheres to modern standards.
