Distinguish between map and a plan

1. A map is a visual representation of an area—a symbolic depiction highlighting relationships between elements of that space such as objects, regions, and themes. 
Plans are a set of two-dimensional diagrams or drawings used to describe a place or an object, or to communicate building or fabrication instructions. Usually, plans are drawn or printed on paper, but they can take the form of a digital file. 
2.  Although most commonly used to depict geography, maps may represent any space, real or imagined, without regard to context or scale; e.g. Brain mapping, DNA mapping, and extraterrestrial mapping. 
Plans are often for technical purposes such as architecture, engineering, or planning. Their purpose in these disciplines is to accurately and unambiguously capture all the geometric features of a site, building, product or component. Plans can also be for presentation or orientation purposes, and as such are often less detailed versions of the former. The end goal of plans is either to portray an existing place or object, or to convey enough information to allow a builder or manufacturer to realize a design. 
3. Many but not all maps are drawn to a scale, allowing the reader to infer the actual sizes of, and distances between, depicted objects. A larger scale shows more detail, thus requiring a larger map to show the same area. 
Plans are usually to scale drawings, meaning that the plans are drawn at a specific ratio relative to the actual size of the place or object.