What is a connectionless protocol?
For our purposes, a connectionless protocol is asynchronous, and without a persistent connection between client and server. One example of a connectionless protocol would be the world wide web, or Hypertext Transfer Protocol (http). In HTTP communications, a client sends a very small piece of data ( a ‘request’) to a server, and breaks off the connection. The server responds by sending out the requested file, then ending its connection. In other words, while you are looking at a web page you are not connected to another computer or using any bandwidth until you click on a link, thereby making another request. Connectionless protocols are bandwidth savers, because only while useful information is being exchanged do the client and server occupy bandwidth.
