Most of the client server and e-commerce environments have some form of persistent data. Hence Data connectivity and delivery from these persistent storages takes a major role in client server environments.
       Some of more popular data connectivity techniques are jdbc (java database connectivity )  which is used for java language to connect to various databases. Like jdbc, odbc (open database connectivity) and oledb (Object Linking and Embedding, Database) used in Microsoft windows platform to connect to various forms of data sources ranging from text files to databases.
         There are numerous types of content that’s delivered across networks. For example media forms like voice over IP, images, Music, Video becoming increasing popular over the internet. Due to firewall restrictions and vendor independence xml is also becoming popular form of data delivery.
          When it comes to data delivery security seems to be one of main concerns. Hence comes encrypted data delivery techniques like https (hyper text transfer protocol secure) and SSH (secure shell). This allows confidentially of data deliverd over public network like internet.
         Also as volume of data that’s delivered across net works increases compression techniques and streaming techniques become increasingly important. Pdf ,zip ,rar for files and jpeg for image and mpeg for audio and video are some popular forms of compress content types.   

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