A reflexive pronoun is a pronoun that refers to another noun or pronoun (its antecedent) within the same sentence.
In the English language specifically, a reflexive pronoun will end in -self or -selves, and refer to a previously named noun or pronoun (myself, yourself, ourselves, themselves, etc.). English intensive pronouns, used for emphasis, take the same form.
In generative grammar, a reflexive pronoun is an anaphor that must be bound by its antecedent (see binding). In a general sense, it is a noun phrase that obligatorily gets its meaning from another noun phrase in the sentence. Different languages have different binding domains for reflexive pronouns, according to their structure.
In Indo-European languages, the reflexive pronoun has its origins in Proto-Indo-European. In some languages, some distinction exists between normal object and reflexive pronouns, mainly in the third person: whether one says "I like me" or "I like myself", there is no question that the object is the same person as the subject; but, in "They like them(selves)", there can be uncertainty about the identity of the object unless a distinction exists between the reflexive and the nonreflexive. In some languages, this distinction includes genitive forms: see, for instance, the Danish examples below. In languages with a distinct reflexive pronoun form, it is often gender-neutral.
A reflexive pronoun is normally used when the object of a sentence is the same as the subject. Each personal pronoun (such as I, you, he and she) has its own reflexive form:
I — myself
we — ourselves
thy — thyself/thyselves (archaic)
you — yourself/yourselves
he — himself
she — herself
it — itself
they — themself/themselves
one — oneself
These pronouns can also be used intensively, to emphasize the identity of whoever or whatever is being talked about:
Jim bought himself a book (reflexive)
Jim himself bought a book (intensive)
Intensive pronouns usually appear near and/or before the subject of the sentence.