Frameworks are made up of both prescribed patterns to structure and organize your code and pre-built, pretested components that you can use to shorten your development time and to aid in code organization.
We have realized that choosing a framework is probably one of the most important decisions you will make about your application.
It's going to determine how long it takes to develop different aspects of your app. It will determine how well you can have multiple developers working on the same code base, and it will determine ultimately how you're going to code your app.