The Darwinian Theory, proposed by Charles Darwin, explains how species evolve over time through a process called natural selection. This theory suggests that individuals with traits better suited to their environment are more likely to survive and reproduce, passing those advantageous traits to their offspring. Over generations, this leads to gradual changes in a species. Darwin's ideas were revolutionary, challenging the notion of fixed species. The theory is supported by evidence from various fields, including genetics and paleontology. It provides a framework for understanding the diversity of life on Earth and how organisms adapt to their surroundings.