In a broad sense, ''weights'' are parameters of a model, usually factors that individually scale (''weight'') specific entries of multidimensional inputs.In artificial neural networks, for example, weights are used to scale input values of an artificial neuron.In machine learning, typically the weights of a model are trained.
ISTQB - CTAI Syllabus An internal variable of a connection between neurons in a neural network that affects how it computes its outputs and that changes as the neural network is trained