In Portuguese, a reflexive pronoun is used when the subject of the sentence is also the receiver of the action. In other words, the subject and the object are the exact same entity.
The pronoun se is the unstressed reflexive pronoun used for all third-person subjects. Because Brazilian Portuguese heavily relies on você and vocês (which take third-person verb conjugations) to mean "you", the pronoun se covers a wide range of English equivalents.
In everyday spoken Brazilian Portuguese, the pronoun se is typically placed before the verb (proclisis), unlike the strict rules of European Portuguese. The action is reflected directly back onto the subject performing it.
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