Title Tag
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What is it?
The <title> tag—not to be confused with the title attribute—is the following:
The
<title>HTML element defines the document's title that is shown in a browser's title bar or a page's tab.
— <title>: The Document Title element - HTML: HyperText Markup Language | MDN
In short, it is used to give a title to your webpage.
Do you need to include it?
Yes, you must include it.
If you do not include it the browsers will use the URL of the website.
Think of it like a name for a person. You can still call that person by specifically mentioning the unique appearance of that person. For example, "Hey, you are the one who uses a hat!". But, that is not convenient. It is better to call the name of that person. For example, "Hey, John!".
Resources
<title>: The Document Title element - HTML: HyperText Markup Language | MDN
Understanding Success Criterion 2.4.2: Page Titled | WAI | W3C
Operable - Accessibility | MDN