Shabbat (Hebrew for 'Sabbath') begins slightly before sunset on Friday afternoon, and ends after twilight on Saturday night.
They prepare their children for Shabbat and light the Shabbat candles.
Shabbat dinner on Friday Evening is usually the most elaborate meal of the week. Observant Jews will light shabbat candles at home just before sunset, and begin the meal with kiddush, a special prayer and blessing over wine and bread. The bread is frequently challah, specially baked for Shabbat. If there is not a communal Shabbat kiddush luncheon in the synagogue, Shabbat lunch at home may be more ornate than the usual lunch, either with cold leftovers from dinner, or special dishes like cholent that are slow cooked overnight. At the end of Shabbat, there is a special prayer and ritual called Havdallah that divides Shabbat from the mundane days of the week. All of the Shabbat religious services can be held in the home for Jews who do not go to the synagogue for communal services.
"Shabbat Shalom!"
They're called Shabbat candles (Neirot Shabbat in Hebrew).
After Shabbat, there is the Havdalah service.
Shabbat Shabbatot
Shabbat comes from the Hebrew word for sit/rest. Shabbat is the day of rest.
Shabbat shalom is a Jewish greeting which we say during the day of Shabbat. See also:More about the Jewish Shabbat
Shabbat Shalom (שבת שלום).Note: This means 'A peaceful shabbat'. The phrase "happy shabbat" is not a phrase that is traditionally used.
There is no issue with swimming during Shabbat, however, you wouldn't be able to shower after swimming until Shabbat ends. (Assuming you wish to be Shabbat observant.)
Judaism.See also:More about Shabbat