Here's a breakdown:
* Lo: This is a contraction of "el" (the) and "lo" (it), and it acts as a pronoun referring to "what happened"
* que: This is a conjunction that means "that" or "which"
* pasó: This is the past participle of the verb "pasar" (to happen)
Here are some examples of how "lo que pasó" can be used:
* "¿Qué pasó?" - "What happened?"
* "No sé lo que pasó." - "I don't know what happened."
* "Lo que pasó fue..." - "What happened was..."
It's important to remember that "lo que pasó" can be used in different contexts, and its meaning can vary slightly depending on the situation.