A blockchain allows recording and distributing information while creating unique digital copies. Information treated this way has many powerful qualities. For instance, blockchain solves the “double spending” problem and makes cryptocurrencies possible.
A router is the bridge between your computer and the Internet. This handy piece of hardware allows your local home network to communicate with the Internet, in turn, allowing your laptop and other devices to go online. Routers usually include multiple network ports for connection to the Internet from several different devices.
A server in computing can serve a number of different purposes. A single server is able to share data among many different client. Alternatively, many servers can be used discretely by one client for performing various computations or sharing with thousands of different clients. All of this is made possible by the computational architecture powering servers.