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IIS 7.0 Output Caching

Introduction

Web content can be divided into two categories: static content and dynamic content. Static content does not change from request to request. The content that gets returned to the web browser is always the same. Examples of static content include HTML files, JPG or GIF files.
The other is dynamic content. This is the response that gets generated for dynamic content changes with every request. Examples include ASP.NET or PHP content.
There is a big range between these two categories which includes semi-dynamic content. Imagine a dynamic ASP.NET page that executes a database query. There is no reason to execute this query on every request if the underlying database tables change infrequently.
The IIS Output Caching feature targets semi-dynamic content. It allows you to cache static responses for dynamic requests and to gain tremendous scalability.
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