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Google for &quot;top level domains&quot; to learn all about those.
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Google for "top level domains" to learn all about those.

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Thank u for your excellent answer, exactly what I was looking for to educate myself. &nbsp;Thank u so much
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Thank u for your excellent answer, exactly what I was looking for to educate myself.  Thank u so much

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You're welcome, glad to help.
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I am trying to understand the url extensions of a web address, like myaddress.au.cu, or something like that. &nbsp;is there any place where I can educate myself. &nbsp;Thank u.
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I am trying to understand the url extensions of a web address, like myaddress.au.cu, or something like that.  is there any place where I can educate myself.  Thank u.

URL extensions

Web development includes all aspects of presenting content on intranets and the Internet, including delivery development, protocols, languages and standards, server software, browser clients, databases and multimedia generation.

Web Development

A web server refers to the software that helps to deliver web content that can be accessed either through the Internet or through an intranet. The primary function of a web server is to store, process and deliver web pages to clients. The communication between client and server takes place using the Hypertext Transfer Protocol (HTTP). The most common use of web servers is to host websites, but there are other uses such as gaming, data storage, running enterprise applications, handling email, FTP, etc.

Web Servers

Web browsers are applications used primarily to display documents, files and media from the Internet, identified by a Uniform Resource Identifier (URI) that can be a page, image, video or other file. Some browsers require the use of add-ons or extensions to safely render the information they receive; others have systems built into them to perform the same functions.