In simple words: you can buy a new domain name from the latest ICANN new gTLD program with an extension that has the exact same meaning as a".com".
9 generic TLDs
I listed nine generic domain name extensions which, I believe, have the same use as a ".com":
- The .GLOBAL new gTLD;
- .CONTACT (not "really" launched yet)
- .HOME (not launched yet)
- .WEB (not launched yet)