Why does a jellyfish has tentacles tha sting?

Jellyfish have tentacles that sting primarily for defense and to capture prey. The tentacles contain specialized cells called cnidocytes, which house stinging structures called nematocysts. When triggered, these nematocysts release toxins that can incapacitate small fish and other prey, making it easier for the jellyfish to feed. Additionally, the stinging mechanism helps protect the jellyfish from potential predators.