Put simply a chaplain is someone who offers care and support to people in need. This can be formally, for example, in prisons, hospitals, armed forces and education or informally in a sports club, shopping centre, cafe or community group. Basically any situation you can think of where support and care are needed chaplains can help. In the case of the iChaplain, chaplaincy comes from a Christian perspective.
A common question some might ask, "what is the difference between church and chaplaincy?"
Currently the NHS offers various outreach services, for example, mobile clinics and medical testing units. These are normally located in communities that are hard to reach for many different reasons. These services do not replace the hospital that sent it, but compliments everything that the hospital offers. That's the relationship chaplaincy has with church, it is part of church, but works out in the community and its various contexts.
Feel free to get in contact if you have any questions about chaplaincy.