The actual meaning of Kaal means death. The person born under Kaal – Sarp Yoga passes through death like situation for the entire life. The Kaal Sarp Yog is formed when all the planets are present in between Rahu and Ketu. According to Indian astrology, there are many types of Kaal Sarpa Yogas are there. If in between Rahu & Ketu all seven planets comes then it is not good.
Kaal Sarp Yog and Kaal Sarp Dosh are one and the same thing. According to the prevalent definition of kaal sarp dosh, When in a Horoscope, all the seven planets namely Sun, Moon, Jupiter, Venus, Mars, Mercury and Saturn are placed between Rahu-Ketu Axis i.e North and South nodes of Moon, then Kaal Sarp Dosh or Kaal Sarp Yog is said to be formed in that horoscope. Depending upon the placement of Rahu and Ketu in the Horoscope, the kinds and effects of Kaal Sarp Dosh may differ and the persons having Kaal Sarp Dosh in their horoscope may suffer accordingly. For example, a person may suffer with delayed marriage or disturbance in married life due to the presence of Kaal Sarp Dosh in his horoscope, whereas some other person may feel obstacles in his professional life due to the presence of Kaal Sarp Dosh in his horoscope, someone else may get some serious disease or diseases due to presence of Kaal Sarp Dosh in his horoscope and someone may not be having a child due to the presence of Kaal Sarp Dosh in his horoscope. So the effect of Kaal Sarp Dosh will be different for every horoscope depending upon the placement of Rahu and Ketu and strength of this defect among some other factors in a horoscope.