Vector analysis is the application of vector methods to problems in engineering and physics. It involves operations like divergence and position vectors. Divergence measures how a vector field changes in magnitude and direction at different points, and is used in electromagnetism like Gauss's law. Position vectors describe the location of a point in space relative to an origin point. Vector analysis also has applications in signal processing, like designing smooth takeoff and landing paths for airplanes by calculating accelerations from initial and final position and velocity vectors.