An eruv (pronounced: AY'roov) (Hebrew: עירוב‎ mixture, also transliterated as eiruv or erub, plural: eruvin (pronounced: AY'roo'VEEN) is a ritual enclosure that some communities construct in their neighborhoods as a way to permit Jewish residents or visitors to transfer objects from one domain type to another, such as carrying an object from indoors (a private domain) to a public street (a public domain) on Shabbat, which they would otherwise understand to be prohibited by Jewish law (Halakha). An eruv accomplishes this by integrating a number of private and public properties into one larger private domain.

The eruv allows these religious Jews to, among other things, carry keys, tissues, medicines, or babies with them, and use strollers and canes. The presence or absence of an eruv thus especially affects the lives of people with limited mobility and those responsible for taking care of babies and young children.

Read more about Eruv:  Definition of The Law of Transference As Part of The 39 Creative Activities Prohibited On Shabbat, Jewish Law and Tradition Regarding eruv, Communities With eruvin, Controversies, Legal Status, Disagreements Between Orthodox Groups