What is a router?

occurs when the sending computer divides a message into a number of efficiently sized units called packets, each of which contains the address of the destination computer

an intelligent connecting device that examines each packet of data it receives and then decides which way to send it onward toward its destination

refers to the geometric arrangement of the actual physical organization of the computers and other network devices$)$ in a network

a model for applications in which the bulk of the back$-$end processing, such as performing a physical search of a database, takes place on a server, while the front$-$end processing, which involves communicating with the users, is handled by the clients