A community cat is a cat that lives outdoors and does not have a specific home or owner, but rather a territory. These cats are frequently social and are being fed by multiple residents in the area. You may refer to these cats as "strays" or "feral", but regardless of the label, these are cats that are thriving outside.
It is important that these cats be sterilized to end overpopulation issues, prevent the spread of disease and stop less favorable feline behavior. The humane solution is Trap-Neuter-Return (TNR).