Hellow friends!!! Thanks for visiting my blog. You are visiting my blog for clearing concept of server. A server is nothing but a program that serves data to its client. For that client have to connect to the server. Server has a protective program which protects it form being hacked by any client or other connection. If you are a programmer you have to secure the server first and then use it as data feeding program. We can take example of Net Protector , Quick Heal and various antivrus which feed updates of their software through Servers. As a programmer you will need some knoledge of Socket/IO in any developing language to develop simple server programs and complex server for clients. Thanks for reading this article. You can take more about servers at https://en.wikipedia.org/wiki/Server_(computing)