talking about hostname

Each device connected to the Internet must be assigned a unique IP address, but IP addresses can be difficult to remember.
Consequently, each device is generally assigned a hostname, which is used to access that device.
The network does not require the use of names, but they do make the network easier to use.
For TCP/IP to work properly, the hostname must be translated into the corresponding IP address.
This can be accomplished through several different methods,
including looking up the hostname in a file called the host table or resolving it through the use of the Domain Name Service (DNS).
Within each organization, the hostname must be unique.
The hostname consists of two pieces: the actual hostname and the TCP/IP domain.
The domain is assigned by a central registry depending on the country you are in and the type of organization you are registering.
The most commonly used domains are .com, .edu, and .gov for commercial, educational, and government institutions within the United States.
While it is possible to obtain a domain using these outside the United States, it is best not to.

For organizations outside the United States, there may be other rules governing how domains are assigned.
For example, a company in Canada named Widgets Inc. could apply for widgets.ca, where .ca denotes that the organization is in Canada.
If the same company was in the United Kingdom, then the domain would likely be widgets.co.uk,
indicating that it is a commercial organization within the United Kingdom