A memorial service is similar to a funeral service in many ways. The main difference is that at a funeral, the body is present as a focal point for the service, whether in a closed or open casket, but at a memorial service, the body is not present. Usually, a framed portrait or an urn serves as the focal point at a memorial service.
Having a ceremony to celebrate the life of a loved one, and offer an opportunity to mourn the loss allows friends and family from near and far to acknowledge the reality of the situation and serves as a good starting marker on the road to healing.