Data science is a multidisciplinary field that uses scientific methods, processes, algorithms, and systems to extract knowledge and insights from structured and unstructured data. It combines techniques from mathematics, statistics, computer science, and domain knowledge to understand and solve complex problems. Data scientists collect, clean, analyze, and interpret data to uncover patterns, trends, and relationships. They utilize various tools and programming languages such as Python, R, SQL, and machine learning libraries to build predictive models and make data-driven decisions. Data science has applications in various industries such as finance, healthcare, marketing, and cybersecurity.