Outreach is the activity of providing services to any population that might not otherwise have access to those services. A key component of outreach is that the group providing it is not stationary, but mobile; in other words, it involves meeting someone in need of an outreach service at the location where they are. Compared with traditional service providers, outreach services are provided closer to where people may reside, efforts are very often voluntary, and have fewer, if any, enforceable obligations. In addition to delivering services, outreach has an educational role, raising the awareness of existing services. It includes identification of under-served populations and service referral and the use of outreach tools like leaflets, newsletters, advertising stalls and displays, and dedicated events. Outreach is often meant to fill in the gap in the services provided by mainstream services, and is often carried out by non-profit, nongovernmental organizations.