There are plenty of parts in your plumbing system that you see and touch daily. Your toilet. Your kitchen faucets. Your shower.
Your sewer line doesn’t make this list, though.
Does that make your sewer line any less important than those other plumbing fixtures and appliances? No, of course not. In a way, it does make it more vulnerable, though.
A sewer line is really just a pipe. But even something as simple as a pipe can run into problems. There’s no engine, and there are no moving parts. There is still a lot that can go wrong.