Out of the ten poruthams prescribed by South Indian Astrological rules, it is called as "Sree Deerga Porutham".
Hindu Rashi/ Nakshatra Matching
In South India, Sree Deerga Matching (Porutham) of the bride and groom. It is mostly done when the marriages are arranged by the families of the boy and the girl.
What is the meaning of Sree Deerga porutham?
Marriage is a serious mater, a lifelong union. Therefore, they desire to make it an auspicious life for the boy and the girl who desire marriage where there is harmony and prosperity. For this reason, they consult the source for looking into the future life of the boy and the girl together. This source is none other than the poruthams. It is a must for them to consult the poruthams before giving a green signal to a marriage. The mental attitudes and temperaments of the individuals contemplating marriage are studied through astral science to avoid sorrows and strife in marriage.
This Porutham gives an idea about the Life Expectancy of the Girl. Also this helps for a comfortable married life. It is believed that the Girl will live for a long time as the wife and her life will end before her husband's life in the old age. That is she will attain the Lotus Feet of God as a Sumangali. However regarding the Life expectancy it is better to check her horoscope.
While counting from the Girl's nakshatra if boy's comes above 13 the match is uthamam. If it comes above 7 mathima porutham.
This porutham gives good longevity and prosperity.