The style tag in HTML is used to insert internal CSS (Cascading Style Sheets) directly into HTML documents. It is placed between the head tags (
) of a document and influences the appearance of HTML elements in the web page. This can be typography, colors, layouts, etc. Unlike external CSS where styles are placed in a separate file, the style tag embeds CSS rulesets directly into the document. However, styles defined in external CSS can override those in a style tag.