A favicon, also known as a shortcut icon, website icon, tab icon, URL icon, or bookmark icon, is a file containing one or more small icons, associated with a particular website or web page.
A website, also written as web site, is a collection of related web pages, including multimedia content, typically identified with a common domain name, and published on at least one web server.
A web page is a document that is suitable for the World Wide Web and web browsers.
What is a Favicon? How to Create a Favicon by Yan S. Huang
A web designer can create such an icon and upload it to a website by several means, and graphical web browsers will then make use of it.
A web browser is a software application for retrieving, presenting, and traversing information resources on the World Wide Web.
How to Add a Favicon to Your Website by Hyndsite Designs
Browsers that provide favicon support typically display a page's favicon in the browser's address bar and next to the page's name in a list of bookmarks.
In a web browser, the address bar is a graphical control element that shows the current URL.
Browsers that support a tabbed document interface typically show a page's favicon next to the page's title on the tab, and site-specific browsers use the favicon as a desktop icon.
In interface design, a tabbed document interface or Tab is a graphical control element that allows multiple documents or panels to be contained within a single window, using tabs as a navigational widget for switching between sets of documents.
A site-specific browser is a software application that is dedicated to accessing pages from a single source on a computer network such as the Internet or a private intranet.
In computing, an icon is a pictogram or ideogram displayed on a computer screen in order to help the user navigate a computer system or mobile device.