To answer your other question: most likely, www.cakefarts.com is now accessible from cakefarts.com for one of three reasons:

1. Your web browser automatically checks the A record “www” if “cakefarts.com” doesn’t have an A record. A records are the records in a DNS server that says “this domain goes here”
2. The site cakefarts.com put their website on cakefarts.com and placed a CNAME record called “www” that points to cakefarts.com
3. cakefarts.com has an APEX record that points to www.cakefarts.com

For the ‘record’, www is just a really common record name. There’s nothing special about it. You could have dudebro.cakefarts.com or wwwwwww.cakefarts.com. It’s up to the domain owner.