Attorney-client privilege is a legal concept that protects the confidentiality of communications between a client and their attorney. This privilege ensures that anything discussed in private cannot be disclosed without the client's consent, allowing clients to speak freely and seek legal advice without fear of their information being revealed. The privilege applies to both verbal and written communications and is essential for maintaining trust in the legal system. It encourages open dialogue, enabling attorneys to provide the best possible representation for their clients while safeguarding sensitive information from outside parties.