What are difference between managed package and unmanaged package?
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Unmanaged packagesUnmanaged packages are typically used to distribute open-source projects or application templates to provide developers with the basic building blocks for an application. Once the components are installed from an unmanaged package, the components can be edited in the organization they are installed in. The developer who created and uploaded the unmanaged package has no control over the installed components, and can't change or upgrade them. Unmanaged packages should not be used to migrate components from a sandbox to production organization. Instead, use Change Sets.
Managed packagesManaged packages are typically used by salesforce.com partners to distribute and sell applications to customers. These packages must be created from a Developer Edition organization. Using the AppExchange and the License Management Application (LMA), developers can sell and manage user-based licenses to the app. Managed packages are also fully upgradeable. To ensure seamless upgrades, certain destructive changes, like removing objects or fields, can not be performed.Managed packages also offer the following benefits:
Intellectual property protection for Apex
Built-in versioning support for API accessible components
The ability to branch and patch a previous version
The ability to seamlessly push patch updates to subscribers
Unique naming of all components to ensure conflict-free installs