Multi-cloud architecture involves using multiple cloud service providers to host different applications, services, and workloads. Organizations are adopting this strategy for its benefits, which include greater flexibility, scalability, and cost efficiency.

Organizations should adopt a holistic approach to security that includes using secure connection models, implementing strict access controls, leveraging security tools from cloud service providers, monitoring network traffic for unusual activity, and having a well-defined disaster recovery plan. Regular security assessments and compliance checks are also essential.

Organizations should be aware of various security threats, including data breaches, Distributed Denial of Service (DDoS) attacks, and malware infections. The connections between different cloud services, referred to as the 'in-between,' can be particularly vulnerable due to network complexity and lack of visibility into security controls.