Couchbase Mobile 2.0 introduces certificate pinning across all its mobile platforms, enhancing security by allowing applications to "pin" a host to its certificate or public key, thus ensuring secure communication between Couchbase Lite and Sync Gateway using SSL/TLS. This method mitigates risks associated with compromised Certificate Authorities (CA) or self-signed certificates by embedding the trusted server certificate within the client app, thereby eliminating the need to rely on external CAs for verification. The blog details the implementation of certificate pinning in an Android app using Couchbase Lite 2.0, highlighting the importance of updating apps with new certificates upon expiration and explaining the configuration process with Sync Gateway. The guidance applies broadly to other platforms, emphasizing the significance of this security technique in safeguarding against Man-in-the-Middle (MiTM) attacks and ensuring reliable server authentication.