"Photoshop, Illustrator, And InDesign: What’s The Diff?" This article provides a useful explanation of the general difference between the various software types and which is best for various tasks.

"GIF, JPEG, and PNG: What’s The Difference?" This article defines various image formats and describes which format is best for various image types and how they will be output. 

"Digital Image File Types Explained" Another article clarifying issues of file types

"Vector And Rastor: What’s The Difference?" This article describes the difference between the two types of software. 

"Differences between RGB and CMYK Color Modes" As the title suggests...