Dependent visa is for Spouse and children of the main applicant residing overseas. UK, Canada, Australia, New Zealand each country has its own streams for sponsorship and permanent resident status.
Australia, Canada has various streams within family sponsorship and as per the classification of visa status of the main applicant.
For dependent visa the visa status of the main application is of foremost importance. The type of application of dependent will depend on it, like student dependent is different category, work permit dependent is different category, and Permanent resident spouse application is different category.
All these application require different documentation and checklist. Most of the categories require good funds, strong relationship proof and good background.