4.What is a URL, an IP address and a DNS? And, why are they important

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A URL is the web address you type into a browser to reach a website. Every website has a URL. For example, the URL www.google.com will take you to Google’s website.

Every URL also has an IP address. An IP address is a series of numbers that tells your computer where to find the information you’re looking for. An IP address is like a phone number—a really long, complex phone number. Because IP addresses were so complex and difficult to remember, URLs were created. Instead of typing in an IP address (45.732.34.353) to go to Google’s website, all you have to type is the URL, www.google.com.

Since the Internet has so many websites and IP addresses, your browser does not automatically know where every single one is located. It has to look each one up. That’s where the DNS (Domain Name System) comes in.

The DNS is essentially the “phone book” for the Web. Rather than translating “John Doe” into a phone number, the DNS instead translates a URL, www.google.com, into an IP address, taking you to the site you’re looking for.