What is the M theory?

Question

What is it?
Give everything about it.

Answer 1

In physics, M-theory (sometimes also called U-theory) is put forward as the master theory that unites the five superstring theories. Edward Witten of the Institute for Advanced Study proposed the existence of this physical model at a conference at USC in 1995, explaining a number of previously observed dualities and sparking a flurry of new research in string theory, called the second superstring revolution.

In the early 1990s, it was shown that the various superstring theories were related by dualities, which allowed physicists to relate the description of an object in one string theory to the description of a different object in another theory. These relationships imply that each of the string theories is a different aspect of a single underlying theory, proposed by Witten, and named "M-theory".

M-theory is not complete as yet [Greene-TFOTC-chapter 13]. It can be applied in many situations (usually by exploiting string theoretic dualities). The theory of electromagnetism was also in such a state in the mid-19th century; there were separate theories for electricity and magnetism and, although they were known to be related, the exact relationship was not clear until James Clerk Maxwell published his equations. Witten has suggested that a general formulation of M-theory will probably require the development of new mathematical language.

Answer 2

Eating half of M&M pack and giving the rest to ones girlfriend in hope that she will put up her G-string.
No it is not is it :) ? What a lame sense of humor is it not?

Now I'm getting serious.
M-theory is just a spinoff from a string theory (not nessesary G-string) .

Does that help?