By default, ServiceNow encrypts data in transit using industry-standard Transport Layer Security (TLS) protocols. This ensures that any data transmitted between the client and the ServiceNow platform, or between ServiceNow and integrated systems, is encrypted and protected from interception or tampering.
While ServiceNow also offers options for data at rest encryption and customer-managed encryption keys, these features often require additional configuration or subscription services. Encryption of data in use (while data is being processed in memory) is a more advanced concept and not provided by default.
Thus, encryption of data in transit is the baseline encryption feature included automatically in all ServiceNow instances.
References:
ServiceNow Security Operations Documentation, Encryption section
ServiceNow Trust and Compliance Documentation
ServiceNow System Administrator Study Guide, Security Chapter
ServiceNow Docs: Security and Encryption