apa style

Q1 A hostname has an extension for example “.com, .net, .org, .edu”. What is this extension? Is it related to the IP address?


Q2: How websites are blocked? And how its contents are identified?

for example in my country the goverment block the websites that have a vidoes or photos about SEX . How they know the websites .. Are they visit it or is there an algorithims to find these sites and blocked automatically.


I with the Questions are clear ….