After Effects uses a language called ExtendScript, ExtendScript comes from JavaScript and uses all the same principles that JavaScript does.
To allow yourself to script within After Effects you must first find the ExtendScript Toolkit, to get here navigate to File > Script > Script Editor. This will allow you access to the ExtendScript editor, ExtendScript saves as .jsx file, however you are also able to export as binary, which has the .jsxbin extension.
If you haven't used ExtendScript Editor before to access all of the features please choose Edit > Preferences > General(Windows) or After Effects > Preferences > General (Mac OS), you must then select Allow Scripts to write files and access network option. ESTK Also has a JavaScript Debugger included which is very handy to know to get to this you must go to Preferences > General and Select the Debugger.
When you type script you must save it within the After Effects file, this is so that After Effects knows where to find the scripts. If your files aren't within the folder then After Effects will not be able to find it.
You are also able to execute scripts from the command line and from AppleScript.
ExtendScript has many functions all are similar to JavaScript;
As you can see there are many different operators out there for the Script if you would like to know what each script do
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