DARE to Discover Data Assimilation is a free online course that gives an introduction to data assimilation without assuming a background in mathematical concepts or any specialist subject knowledge. The course gives an overview of: What is data assimilation?How does data assimilation work?What is data assimilation used for?Some methods for data assimilation - such as variational data assimilation (3D-Var and 4D-Var), and ensemble Kalman FilterReanalysis. The course also encourages you to think a