The Reiki attunement process is how one becomes a channel for Reiki. Reiki attunements can be given only by a Reiki master and can be given for either the purpose of training one in Reiki, or for merely giving someone a greater understanding of Reiki than habitually experienced in treatment sessions. The Reiki attunement process is a ceremony of spirit and intent. This ceremony creates an energy flow on the recipient of the Reiki attunement, which attunes his/her energy field to the Reiki energy flow.
To know more about the three usual Reiki attunement levels and other Reiki systems attunements or order any of these, see the following posts:
Attraction Reiki Attunement
Prosperity Flow Reiki Attunement
It is recommended to give a space of 3 days between each Reiki attunement.