Data Type: All values in a programming language have a "type" - such as a Number, Boolean, or String - that dictates how the computer will interpret it. For example 7+5 is interpreted differently from "7"+"5"
Image: A type of data used for graphics or pictures.
String: Any sequence of characters between quotation marks (ex: "hello", "42", "this is a string!").
Mod: Short for modification. Games in the real world are often a mod of another game. Othello (or Reversi) is usually considered a mod of the ancient game of “Go”. A mod of a program is one that has been altered to do something slightly different than its original purpose.
Stub: A function whose domain and range have been designated, but the process to transform the domain into the range has not yet been defined.
Troubleshooting: When a program generates an unexpected result, a programmer must examine the code to determine the source of the unexpected results (usually an unanticipated input or incorrect handling of an expected input). Sometimes called debugging.