Through the appearance of Local-Area-Networks, PCs came out of their isolation, and were soon not only being connected mutually but also to servers. Client/Server-computing was born.
Servers today are mainly file and database servers; application servers are the exception. However, database-servers only offer data on the server; consequently the application intelligence must be implemented on the PC (client) Since there are only the architecturally tiered data server and client, this is called 2-tier architecture. This model is still predominant today, and is actually the opposite of its popular terminal based predecessor that had its entire intelligence on the host system.
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