AI: Adobe Illustrator file, one of the most widely used graphic design programs in the world. Usually a file with the tag AI is an original design file, meaning that this is the file originally used for developing your design. AI files can generally only be opened successfully using the Adobe Illustrator program and cannot be generally brought into other applications.

EPS: EPS or Encapsulated PostScript is a standard graphics file format for exchanging images, drawings (such as a logo or map) or even layouts of complete pages. An EPS file internally contains a  description of such an object or layout using the  PostScript page description language. It can include both bitmap and vector data.  The purpose of an EPS file is to be included in other pages. Sometimes EPS files are called EPSF files. EPSF simply stands for Encapsulated PostScript Format. EPS files have the extension .eps or .epsf.

PSD: PSD is a proprietary file format used to create and edit images in Adobe Photoshop. It is a widely accepted format as it supports all available image types – Bitmap, RGB, Duotone, Grayscale, Indexed Color, CMYK, Lab, and Multichannel.
PSD files are usually large because of the layers, but the size may be reduced by cropping the individual layers of the image. But cropping has a disadvantage – it limits the ability to edit. Leaving images uncropped may make files large but it has its advantages – the parts that fall outside the cropping bounds are still written inside the PSD file, and can be revealed by increasing the size of the Photoshop canvas.

PSD image files may be opened with Adobe Photoshop or Photoshop Elements on Windows; and Adobe Photoshop, Photoshop Elements, or Apple Preview on Mac OS.

PDF: Portable Document Format (PDF) is a file format developed by Adobe Systems for representing documents in a manner that is independent of the original application software, hardware, and operating system used to create those documents. A PDF file can describe documents containing any combination of text, graphics, and images in a device independent and resolution independent format. These documents can be one page or thousands of pages, very simple or extremely complex with a rich use of fonts, graphics, colour, and images. PDF is an open standard, and anyone may write applications that can read or write PDFs royalty-free.

TIFF:Stands for Tagged Image File Format. This type of graphics file can also be compressed, meaning that it has been calculated down to contain only vital information. Like an EPS file, a TIFF file can also be moved into almost any other application. However, a TIFF file cannot be enlarged without loss of resolution; it can only be reduced.

DOC: A .doc file uses a text or binary file format for storing the documents on a storage media for use by computers. As the doc file format evolved over a period of time, it can be created and read by other softwares such as OpenOffice, AbiWord, and KWord. The only thing is that when files created in one program are opened in another program, the high-level formatting like headers and footers, are los