A more thorough explanation:

Definition: A patient is a person who is receiving medical or psychiatric care.

Examples:

• John is a patient at the hospital because he broke his leg.
• Mary is a patient at the mental health clinic because she is struggling with depression.

The examples illustrate that a patient is someone who is seeking medical or psychiatric help for a health issue. John is receiving medical care for his broken leg, while Mary is receiving psychiatric care for her depression.