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In most source codes, the root package/folder is named "com". Why is that so? It it just convention or does it stand for something?
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It's the domain name spelt out in reverse. For example, one of my domains is hedgee.com. So, I use com. hedgee as the base name of all my packages.
So com. prefix in package names means the same as .com suffix in domain names: "commercial".
Yes perfectly acceptable to have plurals, look at Collections for example, it is a class which has many static methods which help when dealing with different flavours of collection.
A package in Java is used to group related classes. Think of it as a folder in a file directory. We use packages to avoid name conflicts, and to write a better maintainable code. Packages are divided into two categories: Built-in Packages (packages from the Java API)
The convention is that a programmer in a given organization will start package names with their organization's domain name, as a unique identifier -- in reverse order. This prevents namespace clashes between code from different organizations (within the organization you're on your own).
So if I work for a company called Supercompany, and their domain is supercompany.com, all of my package names will start with com.supercompany. And since a lot of code is written for companies, a lot of packages start with com. However, there are plenty of packages that start with "net" or "org" or other such top-level domains. Myself, I work for a university, so my package names generally start with "edu".
The brief answer, then, is that most package names start with "com" because most domain names end with "com".
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