&gt; In fact, I have known several people for years without realizing that they were jewish.<p>I&#x27;m sure those aren&#x27;t the people the parent commenter was referring to.<p>Jews throughout the world follow an incredibly broad spectrum of belief and practice, including an extremely broad set of views about how to relate to other cultures. At the most conservative end, there are some communities who view it as an essential life priority to try to follow all of the laws of the Torah fully and literally. This may include not only the dietary and Sabbath laws, but also rules about sexual modesty and limiting physical contact between the sexes<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Tzniut" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Tzniut</a><p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Negiah" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Negiah</a><p>and for some people also varying degrees of effort to limit social interactions with non-Jews<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Bishul_Yisrael" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Bishul_Yisrael</a><p>See generally<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Haredi_Judaism" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Haredi_Judaism</a><p>for the people who are making the most conscious effort to be socially and culturally separate from secular society.