The BPF Loader is the program designated as the "owner" of all other programs on the network, excluding Native Programs. It is responsible for deploying, upgrading, and executing custom programs.

A program I deployed just before todays class - https://explorer.solana.com/address/8rpHNPsyEJQEJjC2waWvUXyvCkYghCZndACoXs9sNKZg?cluster=devnet