If the only thing you know about Planktons is that they live with SpongeBob Squarepants, you might want to read further. Let me tell you what they really are.
Planktons are microscopic organisms that drift along the river, sea, and ocean. There are two basic kinds of planktons. One is the Zooplankton, and the other one is the Phytoplankton.
Zooplanktons live a few months or a year until they are eaten by their predators. They eat Phytoplanktons, decomposing matters, or even some of their family members!
(Zooplankton)Phytoplanktons are microscopic plants, unlike Zooplanktons. They are consumers (meaning they produce food), so they don’t have to eat. Phytoplanktons can only live up to a day or two until they are eaten.
(Phytoplankton)
Here’s a Plankton food web:
Hopefully this clears up the mystery of plankton for you.