Type of Asset Location in Yii2

Assets, based on their location, can be classified as:

Source Assets

Source asset files are available together with PHP source code which is not accessible directly via the web. To use source assets in a page, they should be copied to a web directory and turned into the so-called published assets. This process is called asset publishing which will be described in detail shortly.

Published Assets

Published asset files are available in a web accessible directory and can thus be directly accessed via the web.

External Assets

The asset files are located on a Web server that is different from the one hosting your Web application.

Reference: Yii2 Doc

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