For example, when a minister marries a couple, he or she typically reads from some prepared text. Words were prepared long ahead of time, without knowing any of the specific names that would be inserted at the time the text was read.
Scripts do the same thing, except there are a few guidelines for creating variables.
Don't begin a variable name with a number 2. Can use a single chracter such as x, or y, or t 3. If complete words, use one word, or two with an underscore. Keep them simple. Long names become difficult to work with.