They produce nectar as an incentive for pollinators
They provide some nutrient (mostly sugar) rich nectar to attract pollinators (mostly insects or birds, but almost never both)
The pollinator eats the nectar from a place where it will rub the pollen on itself. The pollinator then visits another plant, and the pollen rubs off, pollinating the plant.
Any sugar the plant needs to function is simply not made into nectar
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