The Hindu Marriage Act, 1955 - Summary
The Hindu Marriage Act, 1955 was intended to secure the rights of marriage for the bride and groom who are Hindu and are bound under the sacred bond of marriage under any ceremony. This law is binding to any person who is Hindu by Birth or Hindu by Religion.
According to this act Buddhists, Sikhs, Jains are considered as hindu. For deep reading you can download The Hindu Marriage Act, 1955 official pdf released by ministry of law clicking at link given below.