Singular: When referring to a single, unified group of people, "community" is singular.
* Example: "The community came together to support the local school."
Plural: When referring to multiple, separate groups of people, "community" can be used as a plural noun.
* Example: "The communities in this region have different cultural traditions."
It's important to look at the context of the sentence to determine whether "community" is being used as a singular or plural noun.