This document provides an introduction to biophysics, including: - Defining biophysics as the application of physical theories and methods to understand biological processes and systems. - Identifying key areas of study such as molecular biology, structural biology, and medicine. - Explaining how biophysics tools like X-ray crystallography and NMR can provide insights into questions in biology like protein folding and molecular interactions. - Highlighting examples of biophysics applications in medicine like CT scans, ultrasound, and X-rays.