This document discusses various geoprocessing tools available in QGIS for manipulating spatial data. It describes tools such as convex hull, buffer, union, intersect, clip, symmetrical difference, and dissolve. For each tool, it provides a definition, explains how to use the tool in QGIS, and shows an example of the output layer. The document serves as a guide to common geoprocessing tasks and spatial analysis that can be performed in QGIS.