The ELI5 and oversimplidied answer.:
Things are see trough because light can go trough them without interacting with the thing.
Like some things can go trough a filter some not
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The “why” of that cannot be explained to a 5 year old. It is connected to atoms, molecules, electron layers and energy levels.
Different lights can go trough different things. For visible light water, glass are see trough. For UV light, they are not. Infrared light can’t go trough glass.
For radiowaves most of things are “transparent” They can go trough many things
For X-rays. your skin a squishy parts are see trough, your bones are not.
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