Esri's ArcGIS is a geographic information system (GIS) for working with maps and geographic information. It is used for: creating and using maps, compiling geographic data, analyzing mapped information, sharing and discovering geographic information, using maps and geographic information in a range of applications, and managing geographic information in a database. A geographic information system is a system designed to capture, store, manipulate, analyze, manage, and present all types of geographical data. The acronym GIS is sometimes used for geographical information science or geospatial information studies to refer to the academic discipline or career of working with geographic information systems. In the simplest terms, GIS is the merging of cartography, statistical analysis, and database technology. For the Irish think tank, see Economic and Social Research Institute. Esri is a software development and services company providing Geographic Information System (GIS) software and geodatabase management applications. The headquarters of Esri is in Redlands, California. The company was founded as Environmental Systems Research Institute in 1969 as a land-use consulting firm. Esri products have one-third of the global market share. In computer graphics, a raster graphics image, or bitmap, is a dot matrix data structure representing a generally rectangular grid of pixels, or points of color, viewable via a monitor, paper, or other display medium. Raster images are stored in image files with varying formats. A bitmap corresponds bit-for-bit with an image displayed on a screen, generally in the same format used for storage in the display's video memory, or maybe as a device-independent bitmap. A data set (or dataset) is a collection of data, usually presented in tabular form. Each column represents a particular variable. Each row corresponds to a given member of the data set in question. It lists values for each of the variables, such as height and weight of an object. Each value is known as a datum. The data set may comprise data for one or more members, corresponding to the number of rows. In music, the term note has two primary meanings: A sign used in musical notation to represent the relative duration and pitch of a sound, A pitched sound itself. Notes are the 'atoms' of much Western music: discretizations of musical phenomena that facilitate performance, comprehension, and analysis. Source.