Deploying using packages

Packages are containers that can hold metadata components, either one component or a group of components. They are mainly used to distribute an app; the best example of this is Salesforce AppExchange. Packages are also used to deploy the metadata components between any orgs, for example, Salesforce Developer Edition to one of your Sandboxes. There are two types of Packages available and they are as follows:

Unmanaged Packages

Managed Packages

Developers can view and modify the Apex code of components included in an unmanaged package.

It is not possible to view the code of components, for example, Apex class or Apex trigger, in this package.

Components can be edited in the organization after the installation.

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