Pandit NM Shrimali one of the Best Astrologer in India explains Rudraksha is the seed of a particular species of tree which grows at a high altitude in the mountains mainly in the Himalayan mountains. The seeds of the Rudraksha have a very unique vibration. In Hinduism, Rudraksha seeds are used as a medium to offer prayer. The Rudraksha is associated with Lord Shiva and the devotees wear the Rudraksha beads used as a protection against evil.
Pandit Ji says, Lord Shiva, himself wears the mala made of Rudraksha beads. Rudraksha mala is used to chant mantras with repetitions. Usually, the Rudraksha beads are stung into a mala and the number of beads is 108+1. The extra bead is the Bindu. It is believed that there should always be a Bindu in the mala else the energy in the mala will become cyclical and the sensitive devotee might become dizzy.
Shrimali Ji says, When the Rudraksha beads are strung in a thread it should be a silk or a cotton thread. For the persons who travel constantly and who eats and drinks and sleeps at various places, Rudraksha acts as a effective protection. Rudraksha acts as a shield against evil and negative energies and black magic. A Rudraksha can have faces ranging from 1 to 21, which are used for different purposes.
To get more: RUDRAKSHA KA MAHTVA