What term describes the number of places a particular content item is made available?

The term that describes the number of places a particular content item is made available is "Distribution." This concept refers to the various platforms, channels, or locations where content can be shared or promoted. Effective distribution of content is critical for maximizing reach and engagement, as it determines how widely an audience can access the material.

In contrast to the other options, "Exposure" generally relates to the visibility that content gets but does not specifically capture the idea of the number of venues. "Impression" refers to the number of times content is displayed or encountered by users, not the number of platforms. "Frequency" pertains to how often content is seen or delivered to audiences over a period of time, rather than where it is distributed. Thus, "Distribution" is the most accurate term for describing the availability of content across different locations.