Shabbat is the Jewish day of rest. The two requirements on that day are to observe and remember, which are symbolized by lighting two candles at the beginning of the Shabbat (just before sunset on Friday).
The candles are usually lit by the woman of the house and involve a ritual which includes a blessing.
Not being Jewish, I can't give a deeper explanation, but I think that is the gist of it. As Besarien noted, the intent of these small foldable holders would probably be for travel