Ser means "to be". It is used to talk about WHAT something is. It describes the physical characteristics of a person, your job occupation, talking about possesion, or talking about time. However, estar also means "to be" and people often get them mixed. Estar is to talk about HOW something is. Such as: Locations, actions,emotions, and conditions.
Yo soy alto. (Soy is the yo"conjugate of the verb)
Ella es baja. (Es in the el/ella/usted conjugate of the verb)
Nosotros somos estudiantes (Somos is the nosotros"conjugate of the verb)
Ellos son altos. (Son is the ellos/ellas/ustedes conjugate of the verb)
La maestra es baja. (Es the el/ella/usted conjugate of the verb)
Ashley y yo somos amigas (Somos is the nosotros conjugate of the verb)
Nosotros somos americanos. (Same as above)
El es rojo. (Es is the el/ella/usted conjugate of the verb)
