What is benefit of namespace (package) in magento?

Answer 1

We can have more than one module with same name but they should be placed in different namespaces. All magento core modules are contained in mage namespace.

Answer 2

We can have more than one module with same name but they should be placed in different namespaces. All Magento core modules are contained in Mage namespace.
core/Mage/Catalog
local/Muster/CustomModule