A conditioning signal is auxiliary input - such as a text prompt, class label, pose map, or edge map - supplied to a generative model to steer its output toward desired attributes without retraining the base model. Techniques such as classifier-free guidance and ControlNet-style spatial conditioning inject these signals at specific points in the generation process to control content, structure, or style. The strength and fidelity of a conditioning signal determine how closely generated output adheres to the intended constraint.