Yes, ‘appear’ is considered a linking verb. Linking verbs connect the subject of a sentence with a subject complement that describes or identifies it. In the case of ‘appear,’ it helps convey a state or condition of the subject.
For instance, in the sentence ‘The sky appears blue,’ the word ‘appears’ links the subject ‘the sky’ with the complement ‘blue,’ which describes the state of the sky. Unlike action verbs, linking verbs do not express an action but rather serve to provide additional information about the subject.