This document discusses security features in MongoDB databases including authentication, authorization, TLS/SSL encryption, client-side field level encryption, and auditing. Authentication in MongoDB supports SCRAM, SHA-1, SHA-256, and x.509 certificate authentication. Authorization is implemented through role-based access control and management of users and roles. TLS/SSL provides encryption with minimum 128-bit keys. Client-side encryption allows encrypting fields before sending data to the server. Auditing logs database actions to files or syslog.