1. Grid computing:
It is a system in which millions of computers, smartphones, satellites, telescopes, cameras, sensors, etc. are connected each other as a cyber world in which computational power (resources, services, data) is readily available like electric power. Any information at any time at any place can be made available in our fingertips. This is used in disaster management, weather forecasting, market forecasting, bio information, etc.
2. Cloud computing:
It is an emerging computing technology. Herewith the use of Internet and central remote servers to maintain data and applications. Example for this is Email service, Office Software(word processor, spreadsheets, presentations, database, etc),graphics software, etc. The information is placed in a central remote server just like clouds in the sky hence the name cloud computing