apa yang di maksud dengan root level domain, top level domain, second level domain, third level domain dan hosname

]Root level domain = "." (titik) contoh:kambing.uc.ui.id 
top level domain menurut US : .com/.org/.net/.mil/.gov dll
second level domain : brainly.co.id (.CO menandakan second level)
third kambing.uc.ui.id (.UC menandakan Third Level Domain)