Thought you’d like to know what this is:
An eruv is usually thought of as a string around a community but the term actually refers to the process of sharing ownership, done today by having one resident give some “bread” (usually it is a box containing matzo which can last for an entire year) to another resident to keep, to create a joint ownership of food for the whole community. This is usually done by the rabbi of the community to insure that it is done correctly, and the bread is usually matzo to insure that it will be edible and usable for a long time. (It is usually replaced once each year.) In the Talmud and other classic rabbinic sources, the term eruv refers to the bread itself. (from encycl.opentopia.com/term/Eruv )
lilatov 
Thought you’d like to know what this is:
An eruv is usually thought of as a string around a community but the term actually refers to the process of sharing ownership, done today by having one resident give some “bread” (usually it is a box containing matzo which can last for an entire year) to another resident to keep, to create a joint ownership of food for the whole community. This is usually done by the rabbi of the community to insure that it is done correctly, and the bread is usually matzo to insure that it will be edible and usable for a long time. (It is usually replaced once each year.) In the Talmud and other classic rabbinic sources, the term eruv refers to the bread itself. (from encycl.opentopia.com/term/Eruv )
Thank you Peg. That explains it PERFECTLY!!!