How does electrical ground work? Why does electricity want to travel to the earth, which doesn’t seem particularly conductive?

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Some additional questions I have to further understanding:

Ships don’t have ground, but why couldn’t electricity on a ship ground to the ocean the same way houses ground to the earth?

A structure will have a grounding rod dug into the earth. Does the dirt, soil, and rock composition that the structure is built on affect how willing current is to use the path?

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Electrical ground is simply an infinite supply or dump for positive and negative charges. The physical ground is large enough that by plugging a wire into it that we can take or dump as many electrons as we need, which is how electrical ground got its name.

Ground can simply be a large piece of metal as long as the voltages you are dealing with aren’t extreme, but in a house or with a lightning rod, eventually it does go into the Earth because it’s there and it’s free.

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