Delphi combined Pascal with a visual form designer: drag buttons and grids onto a window, double-click to write code, compile to a fast Windows .exe. Thousands of business apps — database screens, reporting tools, inventory systems — were built with it in the 1990s. Anders Hejlsberg's team later moved to MicrosoftThe software giant behind Windows, Office, Azure, and Xbox — founded by Bill Gates and Paul Allen. and shaped C#.

Delphi proved you could build Windows apps as quickly as Visual Basic but get C++-class speed in the finished program.

It kept Pascal alive for a decade of GUIGraphical user interface — windows, icons, and pointers instead of typed commands. development and influenced later rapid-development tools and C#.