Electrical plugs in Italy

I just viewed a video that stated that Italy has 2 different types of plugs - the 2 round prongs that much of Europe uses and another plug that has 3 prongs (the 2 normal round prongs with a 3rd round prong in between the 2 round prongs). Has anyone encountered this type of plug? Will the typical 2-prong European plug work in these outlets? Thanks in advance :-)