PRINT RESOLUTION : Documents that are being sent for print should be 300 PPI to ensure image quality. 
PIXELS PER INCH : PPI (pixels per inch) - The number of pixels in one inch. More (PPI) pixels per inch means better image quality but larger file size. 
RESOLUTION : The amount of detail stored for an image. The higher the resolution, the higher the level of detail in the image.
LOSSLESS : No data is lost during compression of the graphic.
COMPRESSION : Refers to the mathematical algorithm used when an image is saved in order to reduce the file size.
PORTABILITY : The ease at which files are opened, modified, and viewed on computers using different operating systems, software and browsers. 
RGB : The assigns an intensity value to each pixel that ranges from 0 to 255 for each of the red, green, and blue components in an image. If all of the RGB values are 0 the result will be black.
ON-SCREEN RESOLUTION : Monitors can display an image at a resolution of 72 ppi. Additional resolution beyond 72 ppi will increase file size without a noticeable increase in image quality.
INCHES : The standard unit of measurement for US standard size papers that can work well for print. A “Letter” size piece of paper measures 8.5” x 11”, which is the most common size used in printers, for resumes, and other common desktop publishing documents.
COLOR DEPTH : Refers to the number of colors per pixel that can be displayed in an image and affects image quality and file size.
PICAS : A unit of measurement for lines of type with one pica equal to 1/6 of an inch. Therefore, there are six picas in one inch. Picas are often used in print design, as they are more easily divisible than inches, such as with the Rule of Thirds.
LOSSY : Some data is lost during compression of the graphic.
DOTS PER INCH : The number of dots of ink or toner per inch (DPI) on a printed image.
CMYK : Assigns a percentage value for each of the process inks. (cyan, magenta, yellow, black)
GRAPHICS : anything on a page that is not actual text, from simple line drawings to fully active images found on the World Wide Web. The two major categories of graphic images are raster and vector.
COLOR MODE : A mathematical model that describes the way colors can be represented as numbers or percentages, typically with three or four values.
POINTS : The standard unit of measure for typefaces, with 1 point representing 1/72 of an inch, therefore text formatted in 72 point font should be approximately one inch with variation due to font designs. 12 point font is generally accepted as the standard font size for paragraph text in print.
PIXELS : The most common unit of measurement used for computer screen display. A pixel generally represents one dot that is illuminated on a computer screen, many of which make up images. Pixels represent a precise measurement system for web-design, but can lack flexibility as screen size changes.