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. The person who takes birth in this Yoga faces different kind of problems and instability in life like problems in teen age, disturbances in mind, loss in business, family problems etc. A person who has Kaal Sarpa Yoga in the horoscope always fear from death ,suffer from any tension, insecure. This Yoga is more dangerous than other malefic yoga. This Yoga effects a person till 30 to 47 years and some time entire life, it depends upon the position of Kaal Sarp Yoga in the birth chart. So it is important to find out the Kaalsarpa Yoga in the chart and which bhava (houses) are effected. Relationship between Kaalsarpa Yoga and present maha dasha- antardasha etc.
Some very special Yagyas are there to neutralize the Kaalsarpa Yoga in the chart and get more benefic results. It is always wise to do Planet Yagya along with the Kaalsarpa Yagya