1.1.1.1 is a free domain name resolution service, that is, a domain name server, which is jointly owned and maintained by CloudFlare and APNIC. The service was launched on April 1, 2018, and is called "the Internet's fastest, privacy-first consumer-side DNS service" by Cloudflare. Same as google's 8.8.8.8.
1. In your browser, select the three-dot menu > Settings .
2. Select Privacy & Security > Security .
3. Scroll down and enable Use Secure DNS .
4. Click Use and select Cloudflare (1.1.1.1) from the drop-down menu.
Setting URL: chrome://settings/security
After changing dns, some websites may not be opened. . .