What is a program package

Major part of the work of distributors
Contains
Precompiled binary[s]
Configuration
{pre/post}install + {pre/post}remove scripts
Dependencies and other relations to other packages
More than just an archive of files
Enables easy maintenance 
Ensures existence of necessary prerequisites 
Smooth upgrades 
Simplification of security fixes
Basis of modern Linux distributions

Problem: Continuously increasing number of packages