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Active Server Pages (ASP)

PropertyValue
descriptionClassic Microsoft server-side scripting technology used to generate dynamic web pages on IIS.
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ASP usually means Classic ASP, Microsoft’s older server-side scripting technology for building dynamic websites on Windows servers.

It runs primarily with IIS and was widely used before ASP.NET became Microsoft’s main web application platform.

What it does​

Classic ASP generates dynamic web pages on the server before sending the response to the browser over HTTP.

It is commonly used to:

  • Render server-generated HTML
  • Process forms and user input
  • Connect websites to a database
  • Build older internal tools and line-of-business web apps
  • Maintain legacy Microsoft web systems

Core concepts​

Server-side scripting​

Classic ASP executes code on the server, not in the browser.

The browser receives the generated output, usually HTML.

IIS-based technology​

Classic ASP is strongly associated with Microsoft IIS and Windows-based hosting.

It is a web-stack technology from the earlier Microsoft server ecosystem.

Predecessor to ASP.NET​

Classic ASP came before ASP.NET.

That distinction matters because modern Microsoft web development usually means ASP.NET, not classic ASP.

Common use cases​

  • Maintaining older corporate web applications
  • Supporting legacy websites
  • Running older IIS-hosted systems that still depend on server-side script pages
  • Integrating older database-driven admin tools

Practical notes​

  • In most modern discussions, ASP means classic ASP, not ASP.NET.
  • Classic ASP is a legacy technology, even though it still exists in some long-lived systems.
  • It is commonly encountered in maintenance and migration work rather than new development.
  • If a codebase uses .asp files, it is usually a sign that it belongs to an older Microsoft web stack.

Sources Used​

Frequently Asked Questions​

Is ASP the same as ASP.NET?​

No. ASP usually means classic ASP, while ASP.NET is the newer Microsoft web framework family.

Is classic ASP still used?​

Yes, but mostly in legacy systems and maintenance work.

Does classic ASP still matter?​

Yes, when you need to understand, support, migrate, or replace older IIS-hosted applications.