Public Participation GIS (PPGIS) is a way for people to share their opinion about certain topics or areas using maps. PPGIS uses maps to show the different views and opinions of people. For example, if a city wants to know how citizens feel about a new park that is being proposed, PPGIS can be used to plot people's opinions on a map. People can use PPGIS to mark areas where they think the park should be, as well as areas they think should be avoided. This way, people's opinions about the park can be seen easily on a map. PPGIS allows people to have their voices heard and make sure their opinion is taken into account in the decision-making process.