Precision medicine is a medical approach that tailors treatment and prevention to individual patients based on their genetics, biomarkers, environment, and lifestyle. Data scientists analyze genomic sequences, clinical records, and biomarker measurements to predict treatment responses, identify disease subtypes, and guide personalized therapy selection. Key data types include: genomic data (DNA sequences), transcriptomic data (gene expression), proteomic data (protein levels), metabolomic data (metabolites), and clinical data (symptoms, lab results, outcomes). Analysis involves bioinformatics (processing genomic data), machine learning (predicting outcomes), and statistical inference (validating findings).