A group of two or more similar things or people interconnected with each other is called network Some of the examples of network in our everyday life includes: • Social network • Mobile network • Network of computers • Airlines, railway, banks, hospitals networks A computer network is an interconnection among two or more computers or computing devices. Such interconnection allows computers to share data and resources among each other. Types of Networks There are various types of computer networks ranging from network of handheld devices (like mobile phones or tablets) connected through Wi-Fi or Bluetooth within a single room to the millions of computers spread across the globe. Some are connected wireless while others are connected through wires. Based on the geographical area covered and data transfer rate, computer networks are broadly categorised as: • PAN ( Personal Area Network) • LAN (Local Area Network) • MAN (Metropolitan Area Network) ...