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.
grammarA2✓ Vérifiév0.1.0
Explication
The most concrete of the five se's is the reflexive: it marks a third-person subject acting on itself. Se ducha ('he showers'), se levanta temprano, se compró un auto ('bought himself a car'). The se is simply the third-person form of the reflexive pronoun (me, te, se, nos, os, se).
With a plural subject the same se can be reciprocal — 'each other': se conocen, se escriben, se ayudan, se saludaron. Context (or el uno al otro) tells reflexive from reciprocal.
This is the entry point of the whole se system: the other four uses — accidental (se me cayó), passive (se venden casas), impersonal (se vive bien), and the le→se substitute (se lo di) — reuse the same little word for different grammar, each in its own rule.
Exemples
My daughter dresses herself.
Région: global
They greeted each other with a hug.
Région: global
My daughter already dresses and combs her hair by herself.