How does nepenthes trap insect?

Nepenthes, or pitcher plants, trap insects using their specialized leaf structures shaped like deep pitchers filled with a liquid. The inner walls of these pitchers are slick and often contain digestive enzymes, making it difficult for insects to escape once they fall in. When an unsuspecting insect is attracted to the plant by its nectar or bright colors, it slips into the pitcher and drowns in the liquid. The plant then absorbs the nutrients from the decomposing insect, supplementing its nutrient intake from the poor soil in which it typically grows.