what is web hosting manager(WHM) Package?
A package specifies several different values for a cPanel account. For example, you could offer a "power" package that includes 5 addon domains while you have a "pro" package that includes 16 addon domains. When creating new cPanel accounts, you can assign specific packages to each cPanel account. This helps to not only speed up the cPanel account creation process, but it also helps with updating several accounts at once. If you have 20 accounts on one package, modifying a setting for the package itself will apply the setting to all accounts assigned to that package.