NLP stands for Neuro Linguistic Programming and actually is nothing by itself. It is a set of processes, a bunch of tools, that a skilled practitioner can use to elicit the best state available at any time, under any conditions. NLP is not by all means restricted to a textbook but as it is a process, it is directly connected to the practitioner and the client.
You may google around about history and definitions, but what would its use be? What it is important is not the type of pigments an artist use but the skill with which he is mixing them, moving the brush, so as the process, just like a painting, is only limited by the imagination and the creativity of the practitioner himself.
A good practitioner follows no rules, or he follows only one, that there are no rules, anything can be done and there is always a way, just going along with the client until his desired result is being achieved.
Textbooks are guidelines, they are the place that ideas that other people have given birth to can be accessed and used, now, whether these will mature and effectively applied, that is entirely up to the effective communication between the two parts involved.
The practitioner utilizes language to transfer messages while the client makes use of his whole physiology. The client is the one that provides feedback for the most appropriate actions to be taken and mostly, for the most appropriate words to be spoken.
As each and every one of us is building every moment a representation of the world, using the five senses, it is through these senses that different states can be elicited, can be recalled and applied. And it is through those that a bad feeling can be replaced with a good one.
And that seems like a clever choice, doesn’t it?
And that sounds good, doesn’t it?
And that feels great, doesn’t it?
And you just had an extremely short example of how the same thing, said in a different way would appeal in different people.