Seva is a Sanskrit word for selfless service which is performed without any expectation of result or award for the person performing it. The idea of selfless service (seva also sewa) is an important concept in most Indian religions and yogic traditions.
Because God is perceived as having a relationship with others, as well as oneself, serving other people is considered an essential devotional practice of indirectly serving God. Service to make life easier for others. It is one of central tenets of Sikhism. "Living creatures are nourished by food, and food is nourished by rain; rain itself is the water of life, which comes from selfless worship and service." - Bhagavad Gita, 3.14.
Selfless service is also important in Christianity. Jesus often preached it and both Peter and Paul, respectively, wrote about it.