Matrimonial law governs the concept of marriage and marital relations. Within the matrimonial law, we will study the conclusion of marriage in civil form and the conclusion of marriage in religious form with civil effect. The differences between these two forms of marriage refer to the jurisdiction of the body before which the marriage is concluded and the place and manner of the marriage. The effects of civil and religious marriage are the same, including the grounds for their termination. The registrar is a very essential and important person in the marriage process. The legislator assigns him several interrelated duties that enable the marriage ceremony to proceed properly and that in the end the marriage is validly concluded. He checks the personal presence of future spouses, emphasizes the importance of family life, personally asks them if they want to get married and enters the fact of the marriage in the marriage register. An extract from the register of marriages is proof of a concluded marriage. In the case of a religious marriage with civil effects, the registrar does not participate, but only the official of the religious community. The ceremony is conducted according to the rules of canon law, and after the ceremony, the husband and wife, the witness and the official of the religious community, sign the church marriage book and the certificate. of religious marriage in the state register. Marriage law contains provisions on the prerequisites for entering into marriage. Presumptions are divided into presumptions for the existence of marriage and presumptions for the validity of marriage. The prerequisites for the existence of marriage must be cumulatively fulfilled, in order for the marriage to have legal effects (difference between the sexes, a unanimous declaration of consent by the bride and groom, and the participation of an authorized representative of the religious community). In the case of assumptions for the validity of marriage, there are marital obstacles that make it impossible to conclude a marriage. It is about circumstances that are prescribed in order to avoid marriages that are undesirable from a social point of view.