Nominative case (also known as subjective case) is used for personal pronouns when they are the subject of a sentence (e.g., I, he, she, we) and objective case is used for pronouns when they are the object (e.g., me, him, her, us).
A pronoun in the nominative or subjective case is known as a subject pronoun or nominative pronoun (e.g., “she emailed my teacher”).
A pronoun in the objective case is known as an object pronoun (e.g., “my teacher emailed her”).