We use reflexive verbs in Russian when we want to show that the subject and object in a sentence are the same person, performer, or thing.
In English we show that a verb is reflexive by using it with a reflexive pronoun:
Example: I wash myself.
Notice that I (the subject) and myself (the object) are the same person.
Compare the above example to the one below: I wash the car.
The subject here (I) is not the same person or thing as the object (car).
Russian shows that a verb is used in the reflexive form by adding the reflexive particle -ся after consonants and -сь after vowels to the verb, after all other necessary endings have been added.