Soteriology [soe-teer’-ee-aw’-luh-jee] - (Greek soterion, “salvation” or “deliverance” + Greek -logia, “speaking”)
It is the study of the doctrine of salvation. In Christian systematic theology it is used to refer to the study of how the life and death of Christ effectually brings people to salvation. In the broader context of salvation, the idea is essentially synonymous with the concept of redemption and includes a past, present, and future sense.