Gratification is the pleasurable emotional reaction of happiness in response to a fulfillment of a desire or goal.
Desire is a sense of longing or hoping for a person, object, or outcome. The same sense is expressed by emotions such as “craving“.
A person  is a being that has certain capacities or attributes such as reason, morality, consciousness or self-consciousness.
In philosophy, being means the material or immaterial existence of a thing.^[1] Anything that exists is being.
The exact definition of existence is one of the most important and fundamental topics of ontology

(source: wikipedia)