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String theory was first studied in the late 1960s as a theory of the [[strong nuclear force]], before being abandoned in favor of [[quantum chromodynamics]]. Subsequently, it was realized that the very properties that made string theory unsuitable as a theory of nuclear physics made it a promising candidate for a quantum theory of gravity. The earliest version of string theory, [[bosonic string theory]], incorporated only the class of [[particle]]s known as [[boson]]s. It later developed into [[superstring theory]], which posits a connection called [[supersymmetry]] between bosons and the class of particles called [[fermion]]s. Five consistent versions of superstring theory were developed before it was conjectured in the mid-1990s that they were all different limiting cases of a single theory in eleven dimensions known as [[M-theory]]. In late 1997, theorists discovered an important relationship called the [[anti-de Sitter/conformal field theory correspondence]] (AdS/CFT correspondence), which relates string theory to another type of physical theory called a [[quantum field theory]].
One of the challenges of string theory is that the full theory does not have a satisfactory definition in all circumstances. Another issue is that the theory is thought to describe an enormous [[
== Fundamentals ==
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