Title tags are often used on search engine results pages (SERPs) to display preview snippets for a given page.

Title tags are often used on search engine results pages

The page title is so important for SEO of a website, and also important for visitors to find the website.

Title Tag is basically an HTML tag, which is used to give a title to a document/web page, similar to that of a title of a chapter of a book. It helps the users and the Search Engines to gauge what the content of the web page is about.
Title tag still remains one of the most important elements that could contribute towards optimizing your website for better rankings on the SERPs.

A page title, or title tag, is the main text that describes a web page. It is the second-most important on-page SEO element (behind your main body content), is the easiest SEO element to edit and appears in three key places.