A trust store is a secure repository on a computer or device that contains a collection of digital certificates from trusted Certificate Authorities (CAs). These certificates are used to verify the authenticity of remote servers and clients when establishing secure connections, such as HTTPS or SSL/TLS. The trust store helps prevent man-in-the-middle attacks by ensuring that only certificates from recognized and trusted sources are accepted. Administrators can add, remove, or update certificates in the trust store to manage which entities a system trusts. Trust stores are essential for maintaining secure communications in both enterprise and consumer environments.