Flowers are a plant’s advertisement to insects. As the insects draw nectar from the flower, the flower deposits some pollen on the insect. When the insect flies to another flower (on another plant), the pollen is deposited on that flower thereby fertilizing it.
As insects (like butterflies, flies and bees) are attracted to a flowering plant, predators like this jumping spider (Telamonia dimidiata) use their natural camouflage to wait in the flower for the opportunity to grab their next meal. Jumping Spiders don’t spin webs to catch their prey. They are, instead, active hunters that also count stealth as one of their strengths.