Such occult science  are a part of this word, which was originally invented for some “good reason”, let me explain what i meant about “black magic invented for good reasons” you see according to  many Hindu scriptures there were  many great enlightened sages and yogis who used to meditate and acquire powers to help the mankind forwarding their knowledge’s like “AYURVEDA” ( Science of curing diseases and staying healthy )  ” PATANJALISUTRA” ( Science of keeping your body active and healthy this book is the source of YOGA ) and many more knowledge’s which was passed down by great saints but the process of acquiring this knowledge’s was by meditation and by connecting to the god . But there was “ASURS” ( EVIL Creatures, SAITAN ) who used to bring obstacles to this processes and tried to destroy the focus of the Yogis. After seeing such problems this great Saints, and Yogis invented method to bring obstacles, and trouble to the miscreants and evil Asurs , this was for the betterment for humankind. So such black magic was invented to do wrong with the Evil forces but in current era people are using this for their own selfish endeavor.

So yes black magic is a part of this world and it does exist but, there are ways to counter it also.