The Internet is a phenomenon

The Internet is a phenomenon of technological civilisation. It's exceptional complexity surpasses anything mankind has ever created.

Websites

one million+ new internet users every day

Internet users are estimated to be growing by an average of more than one million new users every day. In 2019, there are an estimated 4.39 billion internet users.

There are 1.5 billion websites online.

Insights from the Digital 2019 Global Digital Overview

How Many Domains Are there?

The second quarter of 2019 closed with 354.7 million domain name registrations across all top-level domains (TLDs), an increase of 2.9 million domain name registrations, or 0.8 percent, compared to the first quarter of 2019.

Domain name registrations have grown by 14.9 million, or 4.4 percent, year over year. As of January 2019 there are 1,518,207,412 websites.

Source: Verisign Domain Name Industry Brief

The top 500 sites on the web

Alexa publishes the top 500 sites on the web. These sites dominate web traffic online. You can also view the top sites by category and sub category.

This information is very useful. You can drill down to your niche and locate the movers and shakers. Run those sites through SEO tools (like Ahrefs or Uber Suggest) and you have the keywords and content driving their traffic at your fingertips.

The Internet Map

The Internet map is a bi-dimensional presentation of links between websites on the Internet. While there are more than 1.5 billion websites, less than 1 million, or 0.1%, account for over 50% of all web traffic.

Sources

https://datareportal.com/reports/digital-2019-global-digital-overview

https://www.verisign.com/en_US/domain-names/dnib/index.xhtml