Why only managed package can be released on AppExchange?

Hello Abhinav,

On the AppExchange are distributed both managed or unmanaged packages. Packages are containers that hold the code and metadata associated with apps or components. There are some difference between Managed and Unmanaged package. Managed packages are maintained by the app provider and can be upgraded by the customer. Unmanaged packages are templates where the underlying code can be seen and changed but not upgraded.