Orthodox Jewish men wear them all the time. Conservative and Reform Jews might only wear them when praying in synagogue or in the home.
It depends on your level of observance.
The custom of wearing a kippah, or yarmulke, is very old, and it's true origins are lost to time, but today it is generally associated with the idea of reminding the wearer of God's eternal presence, and/or creating a slight separation between the wearer and God.
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The idea of men covering their heads originated in the Middle Ages by French and Spanish Rabbis. The idea then evolved and the popularity fluctuated until the 1800's when the leading recommendation was to always keep the head covered.
A great article outlining the history can be found at the attached link.
It is unknown. There is no mention in the Torah of Abraham wearing a kippah.
You would wear a kippah on your head; it is a form of skullcap. Religious Jews wear them everywhere they go, while some less-religious Jews wear them only in the synagogue.
A kippah, or yarmulke. http://en.wikipedia.org/wiki/Kippah
They may wear a kippah.
It is placed on the head.
You put it on the top of your head like a hat.
The kippah (also known as a skull-cap or yarmulka) is worn by men of any Jewish denomination. Orthodox men wear the kippah all the time. Non-orthdox men (and some non-orthodox women), usually wear it only in a synagogue or at home during Jewish events. Some Reform Jews wear a kippah all the time.
Jewish teachers (rabbis) typically wear a kippah or yarmulke on their head.
He'll wear a business suit with a tie and even a kippah.
Yes! There are gay-friendly synagogues.
Most Orthodox and Ultra-orthodox Jewish men wear a kippah all the time. Married women in this group also cover their hair in public. Some non-orthdox Jews also wear a kippah all the time, particularly some rabbis and cantors.
It is a small hat that Males wear, the singular is 'kippah' andit is pronounced ( KEY-pah). 'Kippot' is the plural. Religiously observant Jewish men always wear a kippah while other Jewish men, and sometimes Jewish women, wear them while praying.