SVG path fill gradient

Quick answer：

SVG (Scalable Vector Graphics) path fill gradient refers to the use of a gradient fill within an SVG path. A gradient is a smooth transition between two or more colors. In SVG, gradients can be linear or radial. A linear gradient fills the path in a straight line from one end to the other, while a radial gradient fills the path from the center to the edges. To apply a gradient to a path, the gradient must be defined in the SVG document, and the path's fill attribute should reference the gradient ID.