How do electrolytes work in our body?

How do electrolytes work in our body?
Basically, electrolyte is when matter has electricity through itself. There are some organisms and body tools that contain electrolyte. There are three main electrolytes in our body. Sodium, calcium, and potassium. Sodium controls amount of water, and other liquids in your body, calcium makes frame of bones, and tooth, and potassium controls never and muscular system. Many people say that spits are electrolyte, but it isn't actually. Spit is not matter of electrolyte, because there is nothing inside spit. Electrolyte in our body is when certain foods go through our body, and we swallow, it split into several nutrition, such as calcium, potassium, and sodium. That's how electrolyte works in our body. So spit is not an electrolyte. Pee, and poop are electrolyte, pee and poop are way to take out some energies that we had ate, so it contains some nutrituion.