Earthworms are segmented worms that play a crucial role in soil health and ecosystem functioning. They aerate the soil, improve its structure, and enhance nutrient availability by breaking down organic matter. These creatures are often found in moist environments and are vital for agriculture as they help in the decomposition process. With a simple body structure, earthworms have a head, a segmented body, and a tail. They consume soil and organic material, excreting nutrient-rich castings that enrich the earth. Their presence indicates healthy soil, making them essential for sustainable farming practices and natural ecosystems.