Telecommunication has evolved greatly over time. Early forms involved visual or audio signals like smoke signals, but modern telecommunication relies on electricity and electronics using devices like telegraphs, telephones, radios, fiber optics, and satellites. The internet has its origins in the 1950s-60s with the development of computers and early networks like ARPANET. Bandwidth refers to the maximum rate of data transfer, measured in bits per second. Satellites now play a key role in telecommunications by connecting remote areas and allowing global communication. Meteorology, the study of weather and climate, has also advanced significantly with the development of observation networks and computers enabling better forecasting.