grammar.se.reflexive
Se #1: reflexive and reciprocal
Se marks third persons acting on themselves (se ducha) or on each other (se conocen). The most concrete of the five se's.
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Explication
Reflexive: the subject and object are the same — se levanta temprano, se compró un auto ('bought himself'). Reciprocal with plurals: se escriben, se ayudan.
This is the entry point of the se system; the other four uses (accidental, passive, impersonal, le→se) recycle the same word for different grammar — each has its own rule.
Exemples
Mi hija se viste sola.
My daughter dresses herself.
My daughter dresses herself.
Région: global
Se saludaron con un abrazo.
They greeted each other with a hug.
They greeted each other with a hug.
Région: global