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Desalination.
The saline water is NaCl + H2O.
Saline solution
Desalination plants convert sea water into drinking water by distillation.
The process you're describing is distillation, though there may be another name for it in the context of desalination. Pure water is distilled off the solution by the sunlight, condenses, then drips into the cup. Solar Distillation, maybe?
Brackish water (0,05-3% salt), saline water (3-5 % salt), brine (over 5 % salt).
Desalination
Sodium chloride
sodium chloride
This is a saline solution.
hartmans solution
Displacement