Don Kuykendall_RIP
RIP :(
The best way to describe Photoshop actions is to define them as recordings of steps you do in Photoshop. Lets say the you normally add a watermark to all your photos and then resize them down to upload them to this forum. You can automate that so that you just have to click on the action button and it is done.
To create an action:
[*=left]Select a New Action icon,
[*=left]Name the action by double clicking on the icon and typing the name
[*=left]Hit the Record button right before you start editing your photo.
[*=left]Once you are done with editing hit the Stop Recording button. That’s it.
Once you do this then you can do those same editing steps to any photo by just running that action. You can create as many different actions as you want. There are also many actions that you can download from the internet, many that are free, that will do a number of different functions but it is more fun to record your own. Don't worry if you screw up the recording you can always delete it and start over.