At a minimum, a synagogue is a beit tefilah, a house of prayer. It is the place where Jews come together for community prayer services. Jews can satisfy the obligations of daily prayer by praying anywhere; however, there are certain prayers that can only be said in the presence of a minyan (a quorum of 10 adult men), and tradition teaches that there is more merit to praying with a group than there is in praying alone. The sanctity of the synagogue for this purpose is second only to The Temple.

A synagogue is usually also a beit midrash, a house of study. Contrary to popular belief, Jewish education does not end at the age of bar mitzvah. For the observant Jew, the study of sacred texts is a life-long task. Thus, a synagogue normally has a well-stocked library of sacred Jewish texts for members of the community to study. It is also the place where children receive their basic religious education.

Most synagogues also have a social hall for religious and non-religious activities. The synagogue often functions as a sort of town hall where matters of importance to the community can be discussed.

In addition, the synagogue functions as a social welfare agency, collecting and dispensing money and other items for the aid of the poor and needy within the community.