GIS, or Geographic Information System, is a system that captures, stores, analyzes, and presents spatial or geographic data. It uses information from spatial information systems to perform these tasks effectively.

Spatial Information System:
- A spatial information system is a system that deals with data that has a geographic or spatial component. It includes information such as maps, satellite imagery, aerial photographs, and any data that can be linked to a specific location on the Earth's surface.

GIS and Spatial Information System:
- GIS uses the information from spatial information systems to organize and analyze data based on their geographic location. It enables the integration of various types of spatial data to create meaningful information and make informed decisions.

Non-Spatial Information System:
- Non-spatial information systems, on the other hand, deal with data that does not have a geographic or spatial component. They include databases, spreadsheets, and other systems that manage non-geographic information.

Why GIS uses Spatial Information System:
- GIS relies on spatial information systems because it needs geographic data to perform its functions effectively. By using spatial information, GIS can link data to specific locations on a map or in a geographic database.
- Spatial information systems provide the necessary tools and techniques to capture, store, and represent spatial data accurately. They allow the integration of different types of spatial data, such as vector data (points, lines, polygons) and raster data (images, satellite data), which are essential for GIS analysis and visualization.
- GIS also uses spatial information systems to perform spatial analysis, such as proximity analysis, overlay analysis, network analysis, and spatial modeling. These analyses help in understanding spatial relationships, patterns, and trends, which are crucial for decision-making in various fields such as urban planning, environmental management, transportation, and emergency response.

Conclusion:
- In conclusion, GIS uses the information from spatial information systems because it relies on geographic data to perform its functions effectively. Spatial information systems provide the necessary tools and techniques to capture, store, analyze, and present spatial data, which are essential for GIS analysis and decision-making.