On the other hand, the online activation of the serial key is essential in preventing several people from using the same key. In the offline mode, the particular key is entered or also with the help of some particular software like OS. The activation of the serial key can be done offline as well as online. The serial key is usually used to certify that the particular copy of a program is genuine and reliable. It is a specialized software-based or product-based key for a specific computer program. Ever wondered what exactly these are and how to use the same?Ī serial key or the product key also goes by the name as “Software key”. Most of you must have heard about this common terms as “Serial Key or Product Key” about a Software or an Operating System. Everything You Need To Know About “Serial Number Or Product Key” Of A Software Or OS