Computer networks are essential technologies used in many aspects of modern life. They allow for resource sharing, communication, and increased productivity. Some key uses of computer networks discussed in the document include education (allowing online learning tools), business (enabling file sharing and remote access), mobile computing, healthcare (storing patient records), banking (performing transactions), government offices (speeding up processes), and communication (facilitating email and video conferencing). Computer networks provide many benefits but require reliable and secure services to function properly.