Most Common Photoshop file extensions:
PSD
Image file created by Adobe Photoshop, the most commonly used professional image-editing program; may include image layers, adjustment layers, layer masks, annotation notes, file information, keywords, and other Photoshop-specific elements.
PNG
Image format that uses indexed colors and lossless compression (like a GIF file), but without copyright limitations; cannot be animated like a GIF image, though the related .MNG format can.
GIF
Image file that may contain up to 256 indexed colors; color palette may be a predefined set of colors or may be adapted to the colors in the image; lossless format, meaning the clarity of the image is not compromised with GIF compression.
JPEG
Compressed graphic format standardized by the Joint Photographic Experts Group (JPEG); supports up to 24-bit color, which makes JPEG a good format for storing digital photos; compressed using lossy compression, which may noticeably reduce the image quality if high amounts of compression are used.
TIFF
High-quality graphics format that supports color depths from 1 to 24-bit; designed to be a standard image format for storing high-quality color images on multiple computer platforms; may contain multiple layers and pages.
Files may contain text, images, forms, annotations, outlines, and other data; they preserve fonts and formatting electronically across multiple platforms and appear the same on the screen as they will when printed on paper; Google and other search engines now index PDF documents, which can be viewed in a Web browser using the free Adobe Reader plug-in.
BMP
Uncompressed raster image made up of a rectangular grid of pixels; each pixel is a different color (or level of gray for grayscale images), which together form an image; zooming in on a bitmap image will make it appear blocky since the size of each pixel increases.
Most Common Illustrator file extensions:
EPS
PostScript file that may contain 2D vector graphics, bitmap images, and text; may also include an embedded preview image in bitmap format; can be placed within another PostScript document.
AI
Vector image file created by Adobe Illustrator; composed of paths, or lines connected by points, instead of bitmap data; may include objects, color, and text; often referred to as a Illustrator drawing.
Cross-platform document created by Adobe Acrobat or a program with the Acrobat plug in; commonly used for e-mail attachments or for saving publications in a standard format for viewing on multiple computers; usually created from another document instead of from scratch.
Most Common inDesign file extensions:
INDD
Professional page layout project created with Adobe InDesign; includes page formatting information, page content, linked files, styles, and swatches; used for creating and formatting books, magazines, newspapers, flyers, brochures, etc...
Cross-platform document created by Adobe Acrobat or a program with the Acrobat plug in; commonly used for e-mail attachments or for saving publications in a standard format for viewing on multiple computers; usually created from another document instead of from scratch.
Most Common Web file extensions:
HTML
Web page coded in HTML that can be displayed in a Web browser; formats text, tables, images, and other content that is displayed on the page; most pages within static websites have an ".html" extension.
CSS
Used for formatting the contents of a Web page, such as fonts and tables; can define the type, size, color, style, line spacing, and indentation of text; may also describe table padding, spacing, borders; also may be used to position objects on the page.
PHP
Web page that may contain PHP code; may include PHP functions that can process online forms, get the date and time, or access information from a database, such as MySQL database.
JAVASCRIPT
Text file containing JavaScript code; used to execute JavaScript instructions in Web pages; may include functions that open and close windows, validate form fields, enable rollover images, or create drop-down menus.
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