2.It will show whole information regarding that domain name including expiration date
What are sub domains?
A sub domain is a domain that is part of a larger domain. For example: http://news.znetindia.com/ is a sub domain of main domain www.znetindia.com
Domain Renewal
As we renew many of our services on yearly/monthly basis. Similarly domain has to be renewed on their expiration. You can book a particular domain name for a year or any number of years you wish of. As that time passes you can renew the domain with the same provider or you can change your domain provider too.
Domain Parking
In domain parking, whenever a customers website is under construction then in that case a domain is parked. It is the common practice by hosting or domain registration companies to put their logo and link until the site is up.
Domain Forwarding
It is useful when you want your multiple domains/websites to direct at a single domain/website.
Lets take an example: You have domains test.com, test.net, test1.com and you want all of them to direct at test.com. It means when people type test.net, test1.com he/she will automatically gets directed to test.com after setting domain parking.
Check out Know-How about Domain - III to know more about other domain related terms.