Tokens can be anything, words or group of words, or numbers. And also delimiters can be anything, a single number, a comma, a dot, a space. But remember that a delimiter cannot be more than a single character. For the meantime, just remember the example above. Hopefully, that has given you a picture of what tokens are.
Token identifiers are tools in scripting.
They allow you to control strings of data. Once you have understood these, understanding the rest of the token identifiers will not be a problem. This identifier has got to be the most commonly used identifier. Every scripter has used this in one way or another. Here's an example.