for those that follow a strict interpretation of the Torah's teachings, Shabbat, or the Sabbath, is a pretty important part of the practice; on this day, a Jew may not "do work", which includes many activities, such as lighting fires, which, in modern times, includes electricity.
during Shabbat a Jew also faces restrictions on what they may may do outside the home, such as carry objects; this presents difficulties for ex, new parents, as much of modern life takes place in the public sphere. carrying objects is allowed within the "private domain", however