All links open in a new window for your convenience so you dont leave the BPC website. Photoshop actions come in the .ATN file format and put simply, actions are a series of steps that have been recorded by their creator. This sequence of steps can then be reapplied at any time, which allows you to recreate the end result without having to go through each individual step every time. For example, you can create an action that changes the size of an image, applies an effect to the image, and then saves the file in the desired format. Most actions collections come with a fee, depending on the creator. However if you look around on Google, or Yahoo, you can find free ones - it really depends on what you'd like to automate in your workflow.
Craigs Actions /p>
Vandelay Designs - FREE