a hypothesis for the unification of general relativity and quantum theory

String theory is a hypothesis for the unification of general relativity and quantum theory; but since quantum theory has not yet provided an explanation of the standard model of particle physics that is hard to vary, the hypothesis is regularly questioned.

a theoretical framework of physics in which the point-like particles of particle physics are replaced by one-dimensional objects called strings

String theory is a theoretical framework of physics in which the point-like particles of particle physics are replaced by one-dimensional objects called strings.

a broad and varied subject that attempts to address a number of deep questions of fundamental physics

String theory is a broad and varied subject that attempts to address a number of deep questions of fundamental physics.

a theory of gravity

String theory is a theory of gravity, instead of thinking of particles as mathematical points, you think of them as tiny strings.

an attempt to describe general relativity and quantum mechanics with a single mathematical model

In physics string theory is an attempt to describe general relativity and quantum mechanics with a single mathematical model.

a possible unification of all the forces of nature

String theory is therefore a possible unification of all the forces of nature, and most spectacularly nature is a quantum theory of gravity.

21st century physics that fell accidentally into the 20th century

String theory is 21st century physics that fell accidentally into the 20th century.'

the most popular quantum theory of gravity

String theory is the most popular quantum theory of gravity.

one of the proposed methods for producing a theory of everything, a model that describes all known particles and forces and that would supersede the Standard Model of physics, which can explain everything except gravity

String theory is one of the proposed methods for producing a theory of everything, a model that describes all known particles and forces and that would supersede the Standard Model of physics, which can explain everything except gravity.

a purported theory of everything that physicists hope will one day explain … everything

String theory is a purported theory of everything that physicists hope will one day explain … everything.

just one of the most well-known ideas in modern physics

String theory is just one of the most well-known ideas in modern physics, but modern physics’s also among the most confusing.

the quantization of a conformal quantum field theory

As far as I understand, string theory is the quantization of a conformal quantum field theory, treated as a classical theory - apparently in precisely the same way as a spinor quantum field is the quantization of the Dirac particle, treated as a classical field.