Photoshop actions are nothing more than a series of tasks you can record and apply to a single or batch of files. They can be as simple as resizing an image and applying a color overlay to something more complex such as resizing an image, adding a filter, applying an overlay, and renaming them according to a specific rule.
In most cases, Photoshop actions are used to achieve a specific effect on your images without spending hours recreating the effect from scratch every time. While you can certainly create your own Photoshop actions, remember that countless Photoshop actions are available for download online.
Alternatively, you can assign a shortcut to your created action for quick access. This will help you immediately activate the action in Photoshop, and you can use this option for those actions that you use regularly.
For questions strictly about photoshop scripting!Photoshop is a raster graphics editor by Adobe Systems, that is industry standard for creating, modifying and treating images and graphics. It has plugins and scripts that can be installed on top, in order to automate and add further functionality. If you're not scripting for Photoshop, then your question belongs on Super User, Photography, or Graphic Design.
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