In General, Web Applications Have Either Two-Tier Orthree-Tier Client/Server Architectures. the Two-Tier Architecture Was Developedin the 1980S from the File Server Software Architecture Design. Its Intentionis to Improve Usability By Supporting a Form-Based User Interface. It Alsoimproves Flexibility and Scalability By Allocating the Two Tiers Over Thecomputer Network. the Three-Tier (Multi-Tier) Architecture Emerged In The1990s, With a Middle Tier In-Between the User Interface and the Data Managementserver. This Middle Tier Provides Process Management and Is the Place Where Thebusiness Logic and Rules Are Executed. Compared With the Two-Tier Architecture,The Multi-Tier Architecture Increases the Scalability and Flexibility of Webapplications.