Many important inventions have improved lives across several key areas including medicine, transport, industry, energy, free time, and communication. Medicines help people when needed and various modes of transport allow people to go where they want. The steam engine and electric motor revolutionized industry by powering machines to work more quickly. People now enjoy free time through inventions like cameras, music players, and televisions, and computers are ubiquitous tools that receive, store, process and produce information for home, school and work use. The internet is a worldwide computer network that facilitates global communication.