A title tag is an HTML element that defines the title of a web page. Title tags are typically used by search engines to display a page's title in search results. They are also used by browsers to display a page's title in the browser's tab or window title bar.
Title tags are important for search engine optimization (SEO) because they provide a brief, accurate description of a web page's content. Search engines use title tags, along with other factors, to determine whether or not to rank a page in search results. A page with a relevant and keyword-rich title tag is more likely to rank well in search results than a page with a poorly optimized title tag.
While title tags are important for SEO, they are just one of many factors that search engines take into account when ranking pages. Other important factors include the quality and quantity of a page's content, the number and quality of links pointing to the page, and the overall popularity of the website. Optimizing all of these factors can help to improve a website's SEO.