Corrosion is one of the great enemies of the pipes in a plumbing system. It is the main cause of leaks in residential plumbing, since it weakens pipe metal to the point where leaks will start up in multiple places. Eventually, the corrosion will destroy the pipe entirely.
“But I have copper pipes for my home. Copper doesn’t corrode.” Sorry to tell you this isn’t correct. Copper is a corrosion-resistant metal. But the same way that a water-resistant watch isn’t the same thing as a water-proof watch (you don’t want to dunk your watch down in a pool if it’s only water-resistant), a corrosion-resistant metal is not 100%-free from the effects of corrosion. There is a specific type of corrosion that affects copper pipes, and it’s the principal cause of leaking starting in these pipes.