PS stands for PostScript — a type of vector graphic file. Its strength lies in its ability to make digital graphics and text ready to print. You can send a PS file directly to a printer without needing to open it in an application. However, there are only a few different options for opening a PS file, making it one of the least versatile file types for imagery.
Because PS files are a little older than some related file types, it’s often easier to convert PS files to PDFs for smoother handling.