Cellular life refers to organisms that are made up of one or more cells, which are the basic units of life. These cells perform essential functions such as metabolism, growth, and reproduction. Cellular life can be classified into two main categories: prokaryotes, which are single-celled organisms like bacteria, and eukaryotes, which include more complex organisms such as plants, animals, and fungi. Cells contain various structures called organelles that carry out specific tasks. For example, mitochondria produce energy, while ribosomes synthesize proteins. The study of cellular life is fundamental to understanding biology, as it provides insights into how living organisms function and interact with their environments.