Secrets on Helios Cloud is a new feature that allows developers to securely store sensitive data such as API keys and credentials within the SingleStore environment. This feature is baked into the Python SDK and enables users to easily create, manage, and share secrets with their team. The secrets are encrypted and stored with the highest level of security, and can be accessed directly from notebooks by copying a code snippet from the secrets page. With this integration, developers can now safeguard sensitive information in their notebooks without hardcoding values, making it more secure to connect to external APIs and services.