Estar is used to describe location and condition in Spanish. It is conjugated as estoy, estás, está, estamos, estáis, están. Estar indicates where someone or something is located, such as "el museo está a la derecha" (the museum is on the right). It also describes how someone or something is feeling or their general state, like "estoy cansado" (I am tired) or "está enfermo" (he is sick). Common adjectives used with estar include aburrido, cansado, contento, and enojado to express emotions and physical states.