Scientists are individuals who study the natural world through observation and experimentation. They use the scientific method, which involves forming hypotheses, conducting experiments, and analyzing data to draw conclusions. Their work helps us understand various phenomena, from the smallest particles to the vastness of space. There are many types of scientists, including biologists, who study living organisms, and physicists, who explore the laws of matter and energy. Other fields include chemistry, which focuses on substances and their reactions, and environmental science, which examines the interactions between humans and the environment.