Galaxies are found in groups and clusters, we are part of the local group, a name we have given to the galaxy cluster we live in. There are multiple galaxy clusters/groups in our universe. The difference between galaxy clusters and galaxy groups is that galaxy groups are sets of just a few galaxies packed into a region that’s a few million light-years across, while galaxy clusters are sets of a few *hundred* galaxies packed into a region that’s a few million light-years across (making them much denser than groups).
Galaxy groups and clusters aren’t really easy to define, as they don’t really have a set boundary. Multiple galaxy clusters and groups can combine to form a super-cluster of galaxies, which are really big.
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Image from http://msnbcmedia.msn.com/i/MSNBC/Components/Slideshows/_production/ss-090426-misp/ss-090426-misp-07.jpg Some information quoted from http://curious.astro.cornell.edu/about-us/100-the-universe/galaxies/groups-and-clusters/545-what-are-collections-of-galaxies-called-intermediate