Top Level Domain(TLD), the key part of a domain name, separated by Dot.
.com:Abbr. for COMpany or COMmercial, dedicated for company and enterprise.
.net:Very first TLD, dedicated for NETwork
.org:Abbr. for ORGanization, dedicated for Non-profit organization
.edu:Abbr. for EDUcation, dedicated for educational institution
.biz:Abbr. for Business, dedicated for online business activity
.info: Abbr. for INFOrmation, dedicated for company providing information and service
.gov:Abbr. for Government, dedicated for government departments (USA)
.int:Abbr. for INTernational, dedicated for international organizations
.tv:Country Code Top Level Domain (ccTLD) for Tuvalu, also known as Television
3 types of TLD by Internet Assigned Numbers Authority(IANA)
.Global Top Level Domain: gTLD
.National Top Level Domain: nTLD
.International Top Level Domain: iTLD