The Sabbath (or Shabbat, as it is called in Hebrew) is primarily a day of rest and spiritual enrichment.
At about 2PM or 3PM on Friday afternoon, observant Jews leave the office to begin Shabbat preparations. The mood is much like preparing for the arrival of a special, beloved guest: the house is cleaned, the family bathes and dresses up, the best dishes and tableware are set, a festive meal is prepared. In addition, everything that cannot be done during Shabbat must be set up in advance: lights and appliances must be set (or timers placed on them, if the household does so), the light bulb in the refrigerator must be removed or unscrewed, so it does not turn on when you open it, and preparations for the remaining Shabbat meals must be made.

Shabbat, like all Jewish days, begins at sunset, because in the story of creation in Genesis
Ch. 1, you will notice that it says, “And there was evening, and there was morning, one day.” From this, we infer that a day begins with evening, that is, sunset. For the precise time when Shabbat begins and ends in your area, consult the list of candle lighting times provided by the Orthodox Union, by Chabad or by any Jewish calendar.
Shabbat candles are lit and a blessing is recited no later than eighteen minutes before sunset. This ritual, performed by the woman of the house, officially marks the beginning of Shabbat. Two candles are lit, representing the two commandments: zakhor (remember) and shamor (observe), discussed above.
The family then attends a brief evening service.