A title tag is the name a page gives itself in its code. Search engines show it as the blue headline of a result, browsers show it on the tab and Google reads it first to decide what the page is about. It is the strongest on-page signal you control and the first thing a searcher sees.
It is different from the headline on the page, although they often match. Google sometimes rewrites titles it finds too long, too vague or stuffed with keywords, so writing a clear one keeps control with you.
<title> in the <head>, exposed by CMS SEO plugins as the SEO title. Keep the main phrase near the front, around 50 to 60 characters so it is not truncated, one unique title per indexable page and the brand at the end. Google rewrites titles that are boilerplate (Home, Untitled), duplicated across pages, keyword-stuffed or mismatched with the H1, usually substituting the H1 or anchor text.
Do not confuse it with Open Graph og:title, which controls social previews, or the H1, which is the on-page heading. All three should agree in meaning without being forced to be identical.
<title>Invisalign in Riverside | Bright Dental, free first consultation</title> 