Sacrament or Samskar means purification, Hindu have sixteen samskaras from Pre-birth to death. Marriage sacrament or Vivaha samskar is one of the sixteen samskaras.
Hindus still follow sixteen sacrament at different occasions. Marriage is a very pious relation as it the union of two souls. During the marriage time, the priest will tell the sacrament.
Hindu marriage harmonizes two individuals for ultimate eternity, so that they can pursue dharma (moral values), Artha (prosperity), and Kama (love) and Moksha ( final liberation).
It is interesting discussion. Marriage is for completeness, perfection, collective mission of souls, union of consciousness and growth of consciousness. Some problems of life cannot be managed individually so marriage is suggested. It creates synergitic effect by adding strengths of two individuals for facing life challenges on Earth. It leads to Grahasth Ashram wherein one grow materially and spiritually in a blissful manner with full nest of Children. I recommend you kindly see some TV serials produced on the theme of Scriptures such as Devon k Dev Mahadev, Vishnupuran and through the epic SAVITRI written by the Great Sage and Seer Sri Aurobindo Ji