This algorithm iterates over all features of an input layer and calculates the closest points from this features to each feature of a second layer. The count of the closest points will be the product of the feature counts of both layers.
This combobox shows all vector layers of the current QGIS project. For each feature of this layer the closest points will be calculated.
This combobox shows all vector layers of the current QGIS project. The calculated closest points will be located on features of this layer.
The destination where the result should be saved.