Reflexive pronouns are words ending in -self or -selves that are used when the subject and the object of a sentence are the same (e.g., I believe in myself). They can act as either objects or indirect objects. The nine English reflexive pronouns are myself, yourself, himself, herself, oneself, itself, ourselves, yourselves, and themselves.
Grammatical terms might seem complicated and a bit arbitrary when you first hear them, but they really aren’t, once you get to know them.