Remote Sensing: Remote sensing is the collection of data about an object or area without physically being there. This can be done using satellites or other aerial devices.
GIS (Geographic Information System): GIS is a computer-based system that captures, stores, analyzes, manages, and presents various types of geographically referenced data.
GPS (Global Positioning System): GPS is a satellite-based navigation system that provides precise location information anywhere on Earth by using signals from multiple satellites.