To share data (documents, photos), resources (storage, printer), authenticate credentials (e-payment, security access), lookup information (sport scores, stock prices), disseminate information (event invites, job postings), backup data. Client-server model: one way of looking at how computers interact on a network. Describes the interaction of networked computers: clients request information from servers, servers respond with the information (if applicable) Misleading, as any computer can act as a client or server. Computer typically described as client or server based on its role of majority of the time. : file server 1 requests a file from file server 2. Fs1 is the client, fs2 is the server in this interaction. When you access a webpage, website becomes a server and your computer is a client. Bandwidth: the amount of data transmitted along a communication path in a given unit of time; typically expressed in bits per second (bps).