A File System Connector is used to access a folder on the webserver or network. The connector will only be able to access this folder and it's sub-folders but has no access to any of the parent folders.
Consider the scenario where you want to read or retrieve files from a secure folder on your server or network. Essentially something like a working folder for your application. Step in the File System Connector! Create a File System Connector, point it to your folder and provide it with valid user credentials to access the folder. Once created, you can start reading, writing or deleting files from this 'workspace'. You can even assign image files directly to an Image control or allow users to download files to their local pc.