Eli5: what is a heart bypass?

Question

I’m not super familiar with medical stuff. But we found out today my dad needs a bypass and I’m anxious about it, they tried to explain it and I’ve tried looking it up but I genuinely don’t understand what it entails or if he’ll be okay

Thanks

Edit: I don’t have the energy to reply to everyone but ty all for your explanations!! I’m still anxious but feeling a lot less worried knowing what it actually is

In: 9

Answer 1

[Picture](https://newportcts.com/wp-content/uploads/2020/02/during-cabg-graft.png).

Some people call the procedure a CABG (pronounced like “cabbage”).