Keywords: Infrastructure, Civil Engineering, Sustainable development (etc.) Infrastructure states to the fundamental facilities and structures serving a nation, city, or region, including the services and facilities necessary for its economy to function. It typically characterizes technical structures such as roads, sewers, tunnels, bridges, electrical grids, water supply, and so forth, and can be defined as \"the physical components of integrated systems providing commodities and facilities essential to enable, withstand, or enhance societal living index.” The term infrastructure may be confused with the following overlapping or related concepts. Land improvement and land development are general expressions that in some circumstances may include infrastructure, but in the context of an infrastructure would refer only to smaller scale coordination or works that are not included in infrastructure, because they are typically limited to a single parcel and are owned and operated by the vendor. For example, an irrigation canal that serves a region or district would be included with infrastructure, but the private irrigation systems on individual land parcels would be considered land improvements, not infrastructure. Scopes: Engineering and construction Engineers generally limit the term \"infrastructure\" to describe fixed assets that are in the form of a large network, in other words, hard infrastructure. Efforts to devise more generic definitions of infrastructures have typically stated to the network aspects of most of the structures, and to the accrued value of investments in the networks as assets. One such definition from 1998 defined infrastructure as the set-up of assets \"where the system as a whole is intended to be maintained indefinitely at a specified standard of service by the continuing replacement and refurbishment of its components\". Civil defense and economic development Civil defense planners and developmental economists generally refer to both hard and soft infrastructure, including public amenities such as schools and hospitals, emergency services such as police and firefighting, and basic financial facilities. The notion of Infrastructure-based development merging enduring infrastructure investments by government agencies at central and regional levels with public-private partnerships has proven popular among Asian - notably Singaporean, Mainland European and Chinese & Latin American economists. Urban Urban or municipal infrastructure refers to hard infrastructure systems generally owned and ran by municipalities, such as streets, water distribution, and sewers. It may also include some of the facilities associated with soft infrastructures, such as parks, public pools, schools, hospitals, and libraries. Green infrastructure Green infrastructure is a conception that highlights the significance of the natural environment in decisions about land use planning. In particular, there are a prominence on the \"life support\" funct.