⇒ soy = I am/I'm when talking about permanent or lasting attributes
⇒ estoy = I am/I'm when talking about temporary states or locations
⇒ estoy is also used as an auxiliary verb in the present continuous.
| Soy alta, soy mexicana y soy ingeniera.I'm tall, I'm Mexican, and I'm an engineer. |
| Estoy cansado y hambriento.I'm tired and hungry. |
| Estoy en el banco.I'm at the bank. |
| Estoy corriendo en el parque.I'm running in the park. |
⇒ Learn more about the differences between ser and estar here!