Fertility refers to the ability of an individual or couple to conceive a child. In humans, this involves the successful combination of a sperm cell from a male and an egg cell from a female, leading to pregnancy. Factors such as age, health, and lifestyle can influence fertility, making it easier or harder for people to become parents. In addition to human fertility, the term also applies to plants and animals. For example, fertile soil is essential for growing crops, as it provides the necessary nutrients for plants to thrive. Understanding fertility helps in both family planning and agriculture, ensuring a healthy future for both people and the environment.