Title Tag is the HTML element that defines a page title for search engines, browser tabs, and many search result snippets.
It matters because organic search compounds over time when pages are technically accessible, useful, differentiated, and connected to real search intent. Clear SEO terminology also helps teams avoid shortcuts that create long-term risk.
Example
A page about residential roof repair can use a title that identifies that service and the business. The title should distinguish it from a roof-replacement page, while recognizing that search engines may choose different displayed title text.