Eli5: Why does sea water kill us but electrolyte solutions actually hydrate us? Aren’t they both water + salts?

Question

Edit: Question answered. Thanks!

Don’t be too hard on me, I almost failed chemistry:'(

In: 2220

Answer 1

If salt was alcohol, itd be like a glass of beer vs a glass of hard alcohol, ones much more concentrated (for simplification purposes not the same actual ratio of salt in seawater to electrolyte)